The Rampage has been my go-to ball on a variety of conditions for the last ~3 years. I've never tried it at anything but 400 plus high gloss. The ball is a perfect match to my game.
Sounds to me like it is jumping too much on the back. Definitely try 400 plus polish....or even 220 plus polish. This should tame the backend reaction down some, but still clear the heads well.
FWIW, this is the best ball I've ever drilled. It is the only ball I have a NIB extra stashed away.
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Proshop Operator
North Bowl Bowling Center
www.northbowlspokane.comctwings10--"Here's the problem with any retail service - You can't fix stupid."