I have a question regarding the POSKY 737/747/757767-200/300ER. I fly them and whenever they descend, I deploy the speedbrakes and they take forever to slow down.

My Overland A300-600 Slows down faster.

Is there any configurations that I need to make to the Aircraft CFG so that they can slow down faster while descending?

here's the config:
[fltsim.0]
title=Boeing 767-323ER WL American Airlines N377AN CF6-80 1
sim=767-300ER-GE-CF6-80C2
model=wl
panel=
sound=
texture=N377AN
checklists=

atc_airline=American
atc_id=N377AN
atc_flight_number=997
atc_heavy=1
atc_parking_types=GATE HEAVY, RAMP
atc_parking_codes=AAL

ui_manufacturer=Boeing
ui_type=767-323ER/W-
ui_variation=American Airlines N377AN Version 1
visual_damage=1

description=Skyspirit2010 - Boeing 767-300ER V5

[fltsim.1]
title=Boeing 767-323ER WL American Airlines N377AN CF6-80 2
sim=767-300ER-GE-CF6-80C2
model=wl
panel=
sound=
texture=N377AN2
checklists=

atc_airline=American
atc_id=N377AN
atc_flight_number=997
atc_heavy=1
atc_parking_types=GATE, RAMP
atc_parking_codes=AAL

ui_manufacturer=Boeing
ui_type=767-323ER/W--
ui_variation=American Airlines N377AN Version 2
visual_damage=1

description=Skyspirit2010 - Boeing 767-300ER V5

[fltsim.2]
title=Boeing 767-323ER American Airlines N377AN CF6-80 1
sim=767-300ER-GE-CF6-80C2
model=
panel=
sound=
texture=N377AN
checklists=

atc_airline=American
atc_id=N377AN
atc_flight_number=997
atc_heavy=1
atc_parking_types=GATE, RAMP
atc_parking_codes=AAL

ui_manufacturer=Boeing
ui_type=767-323ER--
ui_variation=American Airlines N377AN Version 1
visual_damage=1

description=Skyspirit2010 - Boeing 767-300ER V5

[fltsim.3]
title=Boeing 767-323ER American Airlines N377AN CF6-80 2
sim=767-300ER-GE-CF6-80C2
model=
panel=
sound=
texture=N377AN2
checklists=

atc_airline=American
atc_id=N377AN
atc_flight_number=997
atc_heavy=1
atc_parking_types=GATE, RAMP
atc_parking_codes=AAL

ui_manufacturer=Boeing
ui_type=767-323ER--
ui_variation=American Airlines N377AN Version 2
visual_damage=1

description=Skyspirit2010 - Boeing 767-300ER V5

[forcefeedback]
gear_bump_nose_magnitude=6000
gear_bump_nose_direction=18000
gear_bump_nose_duration=250000
gear_bump_left_magnitude=6000
gear_bump_left_direction=35500
gear_bump_left_duration=250000
gear_bump_right_magnitude=6000
gear_bump_right_direction=00500
gear_bump_right_duration=250000
ground_bumps_magnitude1=3250
ground_bumps_angle1=8900
ground_bumps_intercept1=5.0
ground_bumps_slope1=0.48
ground_bumps_magnitude2=750
ground_bumps_angle2=9100
ground_bumps_intercept2=0.075
ground_bumps_slope2=1.0
crash_magnitude1=10000
crash_direction1=01000
crash_magnitude2=10000
crash_direction2=9000
crash_period2=75000
crash_duration2=2500000


[General]
performance=Passengers\n3-class conf: 218\n2-class conf: 269 \n\nCargo\nLD-2 containers aft \nTotal lower hold volume: 3,770 cu ft \n\nDimensions\nSpan 156 ft 1 in\nLength 180 ft 3 in\nHeight 52 ft \n\nEngines: GE CF6-80C2\nTO Thrust Rating: 60,800 lb\n\nMax Fuel Cap.: 24,140 gal\nMaxTOW: 409,000 lb\nMax ZFW: 295,000 lb\n\nTypical Cruise Speed \n @ FL350: M.80

atc_type=BOEING
atc_model=B763
editable=0


[pitot_static]
vertical_speed_time_constant=999 //Increasing this value will cause a more instantaneous reaction in the VSI


[WEIGHT_AND_BALANCE]
reference_datum_position= 0.000, 0.000, 0.000
empty_weight_CG_position= 0.000, 0.000, 0.000

empty_weight = 198443.000
max_gross_weight = 409000.000

max_number_of_stations = 6

// New FS2004 Numbers
// Max Structural Payload Per Boeing - 96,557 lbs
// Max Structural Payload Opensky - 55,500 lbs

// Actual Total PAX - 38,150 lbs
station_load.0 =4200.000000, 20.000000, 0.000000, 0.000000, 1st Class - 24
station_load.1 =8050.000000, 40.000000, 0.000000, 0.000000, Bus Class - 46
station_load.2 =25900.000000, 0.000000, 0.000000, 0.000000, Econ Class -148

// Total Opensky Cargo - 17,350 lbs
station_load.3 =8175.000000, 45.000000, 0.000000, 0.000000, Lwr Dk Cgo Fwd
station_load.4 =8175.000000, -50.000000, 0.000000, 0.000000, Lwr Dk Cgo Aft
station_load.5 =1000.000000, -70.000000, 0.000000, 0.000000, Lwr Dk Cgo Bulk

// Moments of Inertia
empty_weight_roll_MOI = 10945212.500
empty_weight_pitch_MOI= 11957602.500
empty_weight_yaw_MOI = 19319851.500
empty_weight_coupled_MOI= 0.000
CG_forward_limit= 0.000
CG_aft_limit= 1.000



[flight_tuning]
cruise_lift_scalar =1.000
parasite_drag_scalar =0.950
induced_drag_scalar =1.100
elevator_effectiveness =1.000
aileron_effectiveness =1.000
rudder_effectiveness =1.000
pitch_stability =1.500
roll_stability =1.000
yaw_stability =1.000
elevator_trim_effectiveness =1.000
aileron_trim_effectiveness =1.000
rudder_trim_effectiveness =1.000

[fuel] // Max fuel per Boeing - 767-300 = 16,700 US Gallons / 767-300ER = 24,140 US Gallons
Center1 = 0.000, 0.000, 0.000, 7440.000, 3.000
LeftMain = 0.000, -5.000, 0.000, 8350.000, 3.000
RightMain = 0.000, 5.000, 0.000, 8350.000, 3.000
fuel_type = 2.000000
number_of_tank_selectors=1
electric_pump=0


[airplane_geometry]
wing_area= 3050.000
wing_span= 156.083
wing_root_chord= 20.000
wing_dihedral= 6.498
wing_incidence= -1.000
wing_twist= 1.000
oswald_efficiency_factor= 0.653
wing_winglets_flag= 0
wing_sweep= 31.500
wing_pos_apex_lon= 30.000
wing_pos_apex_vert= 0.000
htail_area= 733.000
htail_span= 53.750
htail_pos_lon= -91.667
htail_pos_vert= 0.000
htail_incidence= 0.000
htail_sweep= 45.000
vtail_area= 325.000
vtail_span= 20.555
vtail_sweep= 35.000
vtail_pos_lon= -87.500
vtail_pos_vert= 5.000
elevator_area= 180.000
aileron_area= 20.000
rudder_area= 56.200
elevator_up_limit= 24.000
elevator_down_limit= 18.000
aileron_up_limit= 24.000
aileron_down_limit= 18.000
rudder_limit= 32.000
elevator_trim_limit= 16.000
spoiler_limit= 45.000
spoilerons_available= 1
aileron_to_spoileron_gain= 1.000
min_ailerons_for_spoilerons= 0.000
min_flaps_for_spoilerons= 0.000



[contact_points]

//0 Class <0=none,1=wheel, 2=scrape, 3=float>
//1 Longitudinal Position (feet)
//2 Lateral Position (feet)
//3 Vertical Position (feet)
//4 Impact Damage Threshold (Feet Per Minute)
//5 Brake Map (0=None, 1=Left, 2=Right)
//6 Wheel Radius (feet)
//7 Steer Angle (degrees)
//8 Static Compression (feet) (0 if rigid)
//9 Max/Static Compression Ratio
//10 Damping Ratio (0=Undamped, 1=Critically Damped)
//11 Extension Time (seconds)
//12 Retraction Time (seconds)
//13 Sound Type
//14 Airspeed limit for retraction (KIAS)
//15 Airspeed that gear gets damage at (KIAS)
// 0 1 2 3 4 5 6 7 8 9 10 11
//point.0= 1, 76.177, 0.000, -15.800, 2181, 0, 1.541, 80.000, 1.447, 1.200, 0.550, 9.000, 9.000, 0, 279.8, 299.8
//point.1= 1, -7.000, -15.250, -15.450, 2575, 1, 1.916, 0.000, 1.200, 1.100, 0.750, 11.900, 11.900, 2, 279.8, 299.8
//point.2= 1, -7.000, 15.250, -15.450, 2575, 2, 1.916, 0.000, 1.200, 1.100, 0.750, 13.100, 13.100, 3, 279.8, 299.8

point.0= 1, 76.177, 0.000, -15.138, 2181, 0, 1.541, 80.000, 0.750, 1.929, 0.550, 9.000, 9.000, 0, 279.8, 299.8
point.1= 1, -7.000, -15.250, -16.155, 2575, 1, 1.916, 0.000, 1.600, 1.100, 0.750, 11.900, 11.900, 2, 279.8, 299.8
point.2= 1, -7.000, 15.250, -16.155, 2575, 2, 1.916, 0.000, 1.600, 1.100, 0.750, 13.100, 13.100, 3, 279.8, 299.8

point.3= 2, -15.000, -78.000, 0.000, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 5
point.4= 2, -15.000, 78.000, 0.000, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 6
point.5= 2, -87.000, 0.000, 0.000, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 9
point.6= 2, 88.000, 0.000, 0.000, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 4
point.7= 2, -67.000, -3.000, 0.000, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 9
point.8= 2, 72.000, -3.000, 0.000, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 4
point.9= 2, 6.000, -27.000, -9.200, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 8
point.10= 2, 6.000, 27.000, -9.200, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 8
point.11= 2, -87.000, 0.000, 37.000, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 8
point.12= 2, 72.000, 9.000, 0.000, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 4
point.13= 2, 60.000, -9.000, 0.000, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 4
point.14= 2, 60.000, 9.000, 0.000, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 4
point.15= 2, -60.000, -9.000, 0.000, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 4
point.16= 2, -60.000, 9.000, 0.000, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 4
point.17= 2, -95.000, -30.500, 9.000, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 5
point.18= 2, -95.000, 30.500, 9.000, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 6
point.19= 2, -95.000, 0.000, 45.000, 787, 0, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 9

static_pitch= -0.000
static_cg_height= 13.500
gear_system_type=0
tailwheel_lock=0
max_number_of_points=20



//
//=======================================================================================================================================================
//


[GeneralEngineData]
engine_type= 1
Engine.0= 5.500, -26.667, -5.583
Engine.1= 5.500, 26.667, -5.583
fuel_flow_scalar= 0.7120
min_throttle_limit=-0.319946


[TurbineEngineData]
bypass_ratio=4.970
fuel_flow_gain=0.002
inlet_area=20.0
rated_N2_rpm=29920.000000
static_thrust= 60800
afterburner_available= 0
reverser_available= 1.000


[Reference Speeds]
flaps_up_stall_speed= 118.000
full_flaps_stall_speed= 94.400
cruise_speed= 452.16
max_indicated_speed=340.000000
max_mach=0.860010


[keyboard_response]
elevator=100.000000,200.000000
aileron=100.000000,200.000000
rudder=100.000000,200.000000

[Views]
eyepoint=81.997949,-2.00,4.00


[autopilot]
autopilot_available=1
flight_director_available=1
default_vertical_speed=800.000000
autothrottle_available=1
autothrottle_arming_required=1
autothrottle_takeoff_ga=1
autothrottle_max_rpm=117.50 //Max N1 = 110.50% for RR RB21, 117.50% for GE CF6, 104.70% for JT9D
pitch_takeoff_ga= 0.000
use_no_default_pitch = 1 // 0 = Default to current pitch mode, 1 = No default pitch mode.
use_no_default_bank = 1 // 0 = Default to Wing Leveler mode, 1 = No default bank mode.
default_pitch_mode=0
default_bank_mode=0
max_pitch=10.000000
max_pitch_acceleration=1.000000
max_pitch_velocity_lo_alt=2.000000
max_pitch_velocity_hi_alt=0.300000
max_pitch_velocity_lo_alt_breakpoint= 7000.000000
max_pitch_velocity_hi_alt_breakpoint=24000.000000
max_bank=28.000000
max_bank_acceleration=1.200000
max_bank_velocity=1.500000
max_throttle_rate=0.02800
nav_proportional_control=9.000000
nav_integrator_control=0.250000
nav_derivative_control=0.000000
nav_integrator_boundary=2.500000
nav_derivative_boundary=0.000000
gs_proportional_control=9.520000
gs_integrator_control=0.260000
gs_derivative_control=0.000000
gs_integrator_boundary=0.700000
gs_derivative_boundary=0.000000
yaw_damper_gain=1.000000


[Radios]
// Radio Type=availiable, standby frequency, has glide slope
Audio.1=1
Com.1=1, 1
Com.2=1, 1
Nav.1=1, 0, 1
Nav.2=1, 1, 0
Adf.1=1
Transponder.1=1
Marker.1=1


[direction_indicators]
direction_indicator.0=3,0


[EFFECTS]
wake=fx_wake
water=fx_spray
dirt=fx_tchdrt
concrete=Opensky_sparks, 1
touchdown=fx_tchdwn, 1

[LIGHTS]
//Types: 1=beacon, 2=strobe, 3=navigation, 4=cockpit, 5=landing 6=taxi, 7=recognition, 8=wing, 9=logo
//light.1 = 1, 48.500, 0.000, 9.800, Opensky_beacon, // top beacon
//light.2 = 1, 12.500, 0.000, -8.700, Opensky_beacon, // bottom beacon
//light.3 = 4, 84.000, 0.000, 3.000, Opensky_Boeing_vclight , // Boeing Orange
light.4 = 3, 55.000, 0.000, -4.000, Opensky_nacelle_refl , // front cargo
light.5 = 3, -32.000, 0.000, -4.000, Opensky_nacelle_refl , // rear cargo
//light.6 = 3, 73.000, 0.000, 4.000, Opensky_nacelle_refl , // pax door
//light.7 = 5, 19.700, 19.000, -4.000, Opensky_nacelle_refl, // nacelle rays from inspection lights
//light.8 = 5, 19.700, -19.000, -4.000, Opensky_nacelle_refl, // nacelle rays from inspection lights
//light.9 = 5 18.000, 27.000, -4.000, Opensky_wing_light, // wing/LE slat rays from inspection lights
//light.10= 5, 18.000, -27.000, -4.000, Opensky_wing_light, // wing/LE slat rays from inspection lights
//light.11= 5, 15.500, -45.000, 12.000, Opensky_wing_light, // wing/LE slat rays from inspection lights
//light.12= 5, 15.500, 45.000, 12.000, Opensky_wing_light, // wing/LE slat rays from inspection lights
//light.13= 5, 42.350, 8.350, -0.250, Opensky_nav_yellow , // flap inspection light
//light.14= 5, 42.350, -8.350, -0.250, Opensky_nav_yellow , // flap inspection light
//light.15= 5, 28.000, -25.000, 0.000, Opensky_wing_light, // wing/LE slat rays from inspection lights
//light.16= 5, 28.000, 25.000, 0.000, Opensky_wing_light, // wing/LE slat rays from inspection lights
//light.17= 6, 80.000, 0.000, -8.350, Opensky_wing_light, // gear bay taxi light rays from taxi lights

[brakes]
toe_brakes_scale=0.43000
parking_brake=1


[gear_warning_system]
gear_warning_available=0
pct_throttle_limit=0.099976
flap_limit_power=25.496622
flap_limit_idle=5.042029


[hydraulic_system]
electric_pumps=0
engine_map=1,1,0,0
normal_pressure=3000.000000


[stall_warning]
type=1


[attitude_indicators]
attitude_indicator.0 = 2
attitude_indicator.1 = 1



[turn_indicators]
turn_indicator.0=1,0


[TailHook] // For opening cargo door.
tailhook_length=1 ;(feet)
tailhook_position = 0.0, 0.0, 0.0 ;(feet) longitudinal, lateral, vertical positions from datum


[folding_wings] // For opening main deck cargo door.
wing_fold_system_type = 4 ;0=None
fold_rates = 0.05,0.05 ;Percent per second
cable_force_adjust = 1.0


[exits]
number_of_exits = 4
exit_rate.0 = 0.10 ;Percent per second
exit_rate.1 = 0.09 ;Percent per second
exit_rate.2 = 0.10 ;Percent per second
exit_rate.3 = 0.09 ;Percent per second


[Flaps.0]
type= 1
span-outboard= 0.800
extending-time= 30.000
system_type= 1
damaging-speed= 200.000
blowout-speed= 250.000
lift_scalar= 0.540
drag_scalar= 0.540
pitch_scalar= 0.500
flaps-position.0= 0.000, 0.000
flaps-position.1= 1.000, 0.000
flaps-position.2= 5.000, 0.000
flaps-position.3= 15.000, 0.000
flaps-position.4= 20.000, 0.000
flaps-position.5= 25.000, 0.000
flaps-position.6= 30.000, 0.000

[Flaps.1]
type= 2
span-outboard= 0.800
extending-time= 30.000
system_type= 1
damaging-speed= 250.000
blowout-speed= 300.000
lift_scalar= 0.540
drag_scalar= 0.540
pitch_scalar= 0.500
flaps-position.0= 0.000, 0.000
flaps-position.1= 10.000, 0.000
flaps-position.2= 10.000, 0.000
flaps-position.3= 20.000, 0.000
flaps-position.4= 20.000, 0.000
flaps-position.5= 20.000, 0.000
flaps-position.6= 20.000, 0.000


[jet_engine]
thrust_scalar=1.200


[electrical]
;BusType, MaxAmpLoad, MinVoltage BusTypes:0=MainBus,1=AvionicsBus,2=BatteryBus,3=HotBatteryBus,4-7=Generator/AlternatorBus(1-4)
flap_motor = 0, 5 , 17.0
gear_motor = 0, 5 , 17.0
autopilot = 0, 5 , 17.0
avionics_bus = 0, 5 , 17.0
avionics = 1, 5 , 17.0
pitot_heat = 0, 2 , 17.0
additional_system = 0, 2 , 17.0
marker_beacon = 1, 2 , 17.0
gear_warning = 0, 2 , 17.0
fuel_pump = 0, 5 , 17.0
starter1 = 0, 20, 17.0
light_nav = 0, 5 , 17.0
light_beacon = 0, 5 , 17.0
light_landing = 0, 5 , 17.0
light_taxi = 0, 5 , 17.0
light_strobe = 0, 5 , 17.0
light_panel = 0, 5 , 17.0


What do I need to edit for these planes to slow down faster on descent?