I have a similar issue and it is driving me nuts. I have been to 2 dealerships, 2 tire stores and a german car specialist and every time they balance the front wheels, they say the previous balance was off. Car has 10k miles and 4/32 left before I hit the wear bars. 15mm spacers make it much worse. Can't find the issue!!!
2009 Silverstone II E92 M3 Coupe - DCT
Dinan Exhaust, RPi scoops, Dinan Tune, Dinan Pulley, BMC filter, LCI Taillights, MS 15mm spacers, Huper Optik tint.