Thanks for all your input but maybe I haven't made clear where my problem lies. I'll try again :)
I hover about 2 - 3 meters above the ground and try to hold the helo in position just using the cyclic (no trimming yet). Yes, this requires practice. And I'm already practicing that a lot. So far no problem (just lack of practice).
Now I have the assumption that when having found a fairly stable position (almost no drift in any direction), pressing the trim button should stabilize that position, meaning after that you have to give even less input to hold that position.
If this assumption is correct then I suppose my G940 is either broken or misconfigured because when pressing the trim button (in a quite stable position!), the helo immediately drops away in some other direction and then it's even more work to recover.
In some other threads I also read that there seem to be problems related to FFB sticks and slight position changes of the stick after trimming, so this could be a similar symptom.
So all I'm asking is to kindly watch the track I attached above and give feedback on whether this input behavior is nomal, I'd really appreciate that! :)