A ball is a ball, and it does what it does.
Many times, I’ve heard pretty good bowlers say they could or would stay with a ball at times when maybe they should change, just because it fit so good that they felt comfortable enough with it to make better quality shots with it.
Certain drilling’s do certain things for certain people. Just because a ball wasn’t originally drilled to your “specs†doesn’t mean it’s bad for you. As a matter of fact, throwing different balls with different drilling’s is how a lot of guys figured out what works best for them, and they didn’t know their specs at the time.
Back in those days, dual angles, Val’s, and paps were not common bowling vernacular, and many guys just knew they threw it good with the pin in a certain spot, and the label in another. For years, all I knew was to drill a ball with finger and negative side weight, lol.
As an example, I was always told that Walter Ray Williams didn’t know his own specs, and didn’t concern himself with them. He just told the shop what he wanted, had them drill it accordingly, then decide whether he liked it or not by the reaction it actually had, not the one it may have been supposed to have. He didn’t care how it was drilled, only what it did for him.
If you do find a drilling that seems to work better for you, you might gravitate towards balls with very similar drilling’s, but you won’t know until you try.