I don't believe you. How would you animate and place 500 birds in the environment with natural flocking behaviour? How would you get the dynamic air-to-air and formation shots? FS Recorder will give you those, with enough ingenuity. Everything else is just a better FRAPS.
That suggests a lack of familiarity with FS Recorder. For all its faults it is/was an amazing program for setting up complex situations in FSX movies. You couldn't do
without FS Recorder. Or
! Those other things just look like screen recorders.
This is normal behaviour in my experience. You can still calibrate it, so I don't see a problem. I use Windows 7, so it's not an Windows 10 update issue. You shouldn't need any Saitek drivers installed, so maybe that's why you see a difference.