Not sure where you got to with this but I've had a judder on mine over 60mph, felt through the seat since I've had it. Went down south this weekend and it was quite bad. Pumped rear tyre up as it was looking low and after that it was horrendous.
I took that wheel off for the spare and it had a massive egg in it. New tyre fitted and the car is smooth as you'd expect from an Audi, tested up to 70 (110)