Keep trying shops until you find one that can fit the ball like a glove. I went to I think 7 in 10 years. All the other shops had my pitches off including lateral on my thumb as well as oval orientation. Most ovals are need to be at 45°, I'm at 40°. I now have a huge callous where your thumb irritation is. Since getting the pitches corrected the thumb has gone down some but still looks deformed. My fingers had round bumps on the top of the first knuckle. Doctor thought it was Rhumatoid arthritis. Finally got tested for it and it came back negative. Was at my Silver class and the instructor (Ron Hatfield) saw my fingers and knew what it was immediately. Too much finger pitch combined with degenerative arthritis caused a build up that had entrapped the tendons. Bowling has always been painful for me, some due to physical issues but most due to improper fit. With my fit correct bowling doesn't hurt my hand much and no more than anything else for the rest of my body. On a positive note, if not for the fit issue I wouldn't have bothered my doctor for the joint pain (common GWS ailment).
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