RE: Great job! Couple issues though.
regarding the panel state - it is saved in a file called GA727.cfg when you end a flight with the 727 (change the aircraft or end the flight sim).
Quite a lot of parameters are saved and exactly that panel situation is loaded once you load the 727 again.
This is a feature so that you can continue a flight.
Regarding the trim - probably you had the autopilot activated when you last ended a flight with the 727 and when you load it a again the AP tries to establish the same configuration.
Best way to reset the panel should be you load and save the "Cold & Dark" panel state again from C-O-M.
Hope this helps,
DF 727 and F1 ATR Documentation