This is actually a trait of what Audi's can do.. go to correct a little oversteer, and it bites you right back, and was the original problem that TTs had prior to their launch, hence the boot spoiler to anchor the rear end down a little better. be it 2wd or 4wd, TT, A3, or A4 they do this! anyone remember the Youtube clip from about a year ago, that showed a guy with an in car camera mounted in his A4, minding his own business on the autobahn, all of a sudden, he's doing a 180, or 360 onto the hard shoulder, luckily missing everything..
Tom
Found it..
http://uk.youtube.com/watch?v=HRGmtObqKeo