Finally found comfort after looking at the chin rest.
I've been playing for years with neck pain. I have tried several shoulder pads of all types and shapes with minimal luck. For whatever reason, I kept swapping the shoulder pads and never thought about changing my chin rest. I've gone through several shoulder pads and was starting to think I needed to put the viola down or go to a smaller size.
Recently, though, I found an old post here suggesting some chin rests for similar issues. Based on some other forums, I ordered a couple of chin rests without a lot of optimism, but I got the jackpot on my second try!
I never realized how much I was forcing things to fit. I ended up even doing some physical therapy because (in part) of trying to make things work that weren't fitting me well.
The whole point of my post is simply to say keep trying if you have any discomfort! There is a combo of shoulder pad and chinrest that will work. Don't focus just one one or the other - both play a role in being comfortable and reducing the risk of injury.
That's all. Happy and wanted to share.