My car is on KW Clubsports dropped a good bit. Ride height should not have anything to do with it. I still think it has something to do with the wheel speed sensors. Bearings wouldn't cause that problem IMO. Unfortunately, most people at dealerships are idiots. My local dealership is actually pretty good now under new management, but I feel your pain.
I remember when MartinD bought his 2011 E90 M3 he had some similar issues on the track. I don't know if it was resolved before he ended up just trading the car back in.
Current: 2015 F80 M3 (SS, Full Black Interior, 6MT, LED Lights, Adaptive Suspension, 19's)
Previous: 2013 E92 M3, 2013 F10 M5, 2009 E90 M3, 1998 E36 M3