I tried mine, at first, at 4000 no polish. Went to long. Took off polish, nice....but. Went 2000 polish, nice hook, good backend. Went 2000 no polish and that, for ME..was gold. Good drive, hard backend hook was later than mid lane but not a pure snap. Hard to explain but our oil moves fast so I needed something "special" for what I see most.
Never fear mixing the cover, try one thing, might have to add polish, might need to take it off, just a great cover to play with and accepts changes great. It's one ball that you'll have to play with the cover to find the right one that is best for you.
Hope this helps.
BTW, it also depends on the polish you use. I used Factory Finish but didn't like the reaction. Changed to Magic Shine and that was better, but found, again for me, no polish was best.
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az guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net
www.rlbowlerspro.com