Again I am betting on a bad RPM signal coming from the ignition or a bad cluster. If you were slipping the RPMS would race and likely bog back down when the clutch/tires caught. It wouldn't just "stick".
It is very possible to wear a clutch at 9k if it is overly abused, even if not intentional especially if it wasn't broken in properly but I still don't think that is the issue.
Buy or borrow a dirt cheap tach and hook it up and see if it matches what your cluster is showing when you accelerate. I am sure you could find one on ebay for $20 or find your nearest Honda Civic club.
Or even better, if your within warranty take it to the dealer and save your time/money.
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