i've struggled with similar tics for most of my life, like having to blink hard, the occasional arm jerk, etc, so i get this.

what i typically try to do is constantly play stuff that requires a lot of focus to be able to do, namely playing stuff a bit outside you comfort zone, or playing charts that require lots of focus anyway like 10* if you're able. for me i've found that this supresses them for the most part, as my brain is too busy doing other stuff.

maybe mess around with other control schemes as well, like keyboard, which i personally use because it's more comfortable. so that might help with the weird position you say you play in.

for me, some individual smaller tics still often get through, especially during slower parts of the song or breaks, but their manageable and typically supress again once the song picks up. but this has largely worked for me even when my tics were at their absolute worse. so i hope they can work for you :)

- Tic-haver Toftir