Bought a used 13 GT, has all the bolt on and tuned on 91 octane. Trans is a Ben Calimer stage 1 rebuild with about 9,000 miles on it. Previous owner put it in with OEM style clutch and flywheel, spec stage 2+ pressure plate, and did not replace the throw out bearing(why!). The throwing bearing is making noise but still drives good and shifts good when just cruising. However when I get on it and shift anywhere above about 4,500-5,000 rpms it’s almost like the shifter does not want to come out of 1st for a second or two, then takes a second to be able to get it into 2nd gear. The pedal is moving but it’s feeling like the clutch is sticking to the flywheel or something. Do you all think this is a weak clutch problem? Thanks