in the game the trim is "real time" meaning where the rotary is at is where the trim goes.
IE:
rotary in dead center trim in center, rotary at 80% up, the trim is 80% up.
in the game you need to "activate" or whatever the rotaries in calibration, just like the axis on your stick / rudder / throttle. treat them like a mini throttle, and go through a full calibration.
that sould fix the problem.
thinking,,,, another possibility is in AH 1 to use a rotary you have to have it "banded" or something, and map an actual keystroke (I or K for elevator) to each part of the band. if you set your stick up like that, and have combat trim off in AHII (and didnt un-map that from your stick) that is another possibility.
hope that helps.