Can you show us some pics of your car on the VS8.2s?
Don't you get tire rubbing up front at full lock?
Funily enough, just yesterday I got a wheel balancing on my VS8s mounted on the car and the shake is gone. I always thought that the tremble was caused by the missing bolts from the engine mount, but that was not the case.
EDIT
Found pictures!
http://www.z4-forum.com/forum/viewto...26558&p=367692