I wouldn't be surprised if you're having some clutch slip up in the higher RPM's with it being pretty worn out.
I was having that on my old clutch for who knows how long, just saw it on the dyno last Friday when I was getting retuned for 60# injectors and before I put the new clutch in. It pulls to ~105+ now in 3rd @ 6,500 - whereas before it would only show ~100 on the speedo but ~6,5k on the RPM because of slip.





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