I'm almost a 100% certain that all the problems you are relating to (vibration) is caused through the twomass-flywheel.
I had a Audi S3 (not sold in the US) with very similiar problems. Needless to say, it took Audi 3 times to solve the problem (after denying it first...). So that was a 3 time clutch out-clutch in job.
After the last replacement it finally felt like it should have been...
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