I've read a few messages on here regarding trim issues with the F-5 and I'm having the same problem. Anytime a try to make a trim adjustment, it will go to either full up or full down. I've tried a resetting the mapping to my joystick (T.16000M & TWCS throttle). I do not have Sync HOTAS or Force Feedback selected. I have the latest drivers. I just downloaded DCS World 2.5 and the F-5 is my first mod.
Also, why are there two different control assignment options for the F-5? One says F-5 Sim and the other F-5 game?
Regards