Check all the tie rods, bushings, endlinks and that everything is properly tight.
Loosen everything and tighten with the car on the ground at ride height.
Double check you ride height that it's perfectly even.
Make sure your rotors and wheels are seating properly.
Swap the wheels around doing some testing.
Did you get to see the alignment printouts to compare and verify, it was a 4 wheel alignment?
Borrow a set of wheels tires off of a friend/coworker/forum member for a few days of testing.
2008 135i - Cobb AP, MS DP's, Berk street exhaust, AMS IC, BMS DCI, CDV delete, Quaife LSD, M3 control arms, M3 rear SF bushings, SS brake lines.