I know exactly what you are talking about Dan... i drill most of my own equipment and when i underspanned it by even an eighth of an inch it feels strange and the timing of the release becomes a little different and it can affect ur whole shot. It is funny, u are not the only person that have been underspanned and told u need to learn to bowl, he somehow manages to convince his customers that his underspanning is "ok" and they get used to how their ball feels, but when they go to another proshop that drills their balls right, they THEN find out how a properly fitted ball SHOULD feel!
Hey Dan, maybe u actually know me in person! Do u bowl in Cheso? I bowl there once a week, maybe PM me so no one knows
R