Pressure plate was also renewed, yes, along with disk, master and slave cylinder (metal ones). But really now how could a new clutch disk wear out literally so fast to the point where it slips already? So even if it's in gear it still could be either the flywheel or the clutch disk you're suggesting? But since we already know that the flywheel is causing the vibrations, wouldn't it be reasonable thinking that the flywheel is also causing the slippage and that the clutch disk can still be fine as it should with no premature wear? I am just asking now if this could be possible in my case, not if it really is so, of course no one can say for sure, only estimating
