Clutch Recommendations

[BALLSS]

well you could just remove the dust cover and add 2 of the screws that did hold on weight you took off to see if that affects the vibe +/-

if you push in the clutch sustaining at the RPM the vibration happens and it is still there....its motor based. Could certainly be pinon angle to, especially at higher speed, or drive shaft balance, especially stock shaft running 3:73 , 4:10 and lower

usually a engine balance issue is all rpm