Only? I thought 410 was considered fairly high?
Have you changed anything since developing arthritis? This clip at about 4:15 min, Walter Ray talks about changing his grip due to arthritis. Says he went with a relaxed grip.
https://www.youtube.com/watch?v=Oa5I7l05Wr4
I ask because I feel that my grip was made too stretched on my first (current) ball, which I believe could lead to that kind of problem further down the road. I've read (probably on this forum) how the old-school way was to stretch the span out as much as possible, and I'm thinking the driller I went to is probably old enough to have learned during that time.
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