Controller suggestion? Hand is locking up.

Hey, so I've used an XBome controller for... God knows how long. I've been playing Mina the Hollower and realized that it's causing some pain along the muscles going from the top of my left middle and ring finger past my wrist; I've got piano fingers and kinda grip the analog pretty hard, so my fingers are going past 90° holding the thing and I'm pretty sure I shouldn't be doing this anymore.

I think if I had a bigger controller I'd be fine? I'm trying my arcade stick, but it's not great for fine motion like the analog. Does anyone have any experience with having to move out of their usual controller due to pain, and what did you do?