How are tightening? with impact gun or by hand? Too tight should not affect the clutch dis-engagement. You are talking about the main nut in the center of clutch right? I put my slipper in at home and had zero problems. Something else is going on. concerning a stripped out bolt on the cylinder side, try a longer bolt and tighten that one last so you put less pressure on it . It is easy to strip the smaller bolts after repeated use.