If your arm goes out after only 3 games you should probably go to 14. You have a 14 lb spare ball anyways. Does your thumb hurt at all? You have a big backswing (which is good) so you either have a ball drilled perfectly or your using extra thumb pressure which will delay your release and lower your revs.
If you’re just doing house shots (no sports patterns) you can probably get away with getting a middle of the road polished ball. Bowlingball.com is great for research as is getting a demo day at an alley.
There are probably coaches near you. Most high school and community college coaches also give lessons to us common folk.
https://www.bowlingball.com/findbowlingcoach.aspx
Might find one here or ask a driller. PSOs get referral business from coaches so they should know.
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