well!!! your engine is far from stock!!!!!! you can't expect those RPM's from a stock engine.
To see if your belt is hitting the rivets in the driven- at the bottom of the driven is rivets holding the sheaves, if they're shiney then the belt has been making contact(fraying on the bottom edge of the belt). When at WOT for extended length the belt will try and go deeper into the driven and bump the rivets.
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