I'm no pro, and a little info can be harmful. What's the tire look like? Rebound issues will show up in the tire wear. I recall that too much preload will do that also. Man, there's so many variables. I'd start with checking the sag first. Then work the bike up and down, seeing how it rebounds. Is it too fast? Too slow? Are both ends balancing out?
Pics of the tire are helpful
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