One thing I might suggest that I left out of my precious post.

My physical problems concerning repetitive motion is from pinched nerves in my spine. It causes pain and numbness in my hands and arm, as our bodies are all connected through the nerves that thread through our spine.

Posture issues and neck/back strain and fatigue is inherent with musicians like us that play for long periods.

That might be something to check into medically just to be aware of all the moving parts in your situation.

Best.