Hey Nollster,
Jeffrevs offers a very good suggestion. You can shorten the core and lower the differential as it also helps remove some finger weight (or add thumb) at the same time. Another thought may be to take it down to 600 for a little rougher cover so it can actually grab a little sooner and not store as much energy on the back. Based on your leaves, the backends sound very clean. The grittier finish should still easily be able to finish well for carry. Hope this helps...
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Rick Leong - Ten Pins Pro Shop
Track Intl. - Amateur/Pro Shop Staff
Vise Inserts Staff
Trackbowling.com