For the trim to hold well (assuming you are talking about Helicopters), you need to play around with
For the trim to hold well (assuming you are talking about Helicopters), you need to play around with friction settings. For helicopters in general I would recommend to use very light spring (or none) and more friction and damping (and a bit of inertia) to give the stick the right „feeling“. And personally I use the hardware enabled trim function of the VP software rather than in-game force trim.
