Are the vibrations while you are still engaging the clutch or after you have fully released the pedal? How many miles on current clutch? Any aftermarket goodies that effect HP? Brake fluid reservoir at the proper fill level? Any fluid seepage / dripping under the transmission?
If you are not getting clutch slippage when you give it the beans, I am doubting that you have a problem with the clutch & flywheel. It could be something as simple as worn out / broken engine & transmission mounts. Also could be a failing slave cylinder.
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