Its the cover plate which looses the claping force, you can put an brand new oem friction plate in there only to find is will slip with the added torque.
All we do is fit brand new OEM friction & pressure plates to customer cars and on the 130/150bhp are good for over 340lbft.
What bhp TDI engine do you have, how many miles and what power are you looking at going for?
Nick