Currently my Classic Rock's finger insert is shrinking, guess it's spoilt. That's what I heard from my coach. But I feel comfortable in that inserts, now I guess I have to change them because I can't "feel" the inserts anymore, and I don't see my ball rolling in a axis rotation.

Even how much angle I turned or how much lifting I used, the ball just continue to forward roll.

The problem here is, Should I change to a tighter finger inserts, or a insert which fits just nice? Which will create a higher roll?