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It isn't really unusual to eat the outside of the fronts - it is an endemic problem that only gets worse the harder you drive them; no standard way to add camber. Factory RFT's make it much worse, as they seem to have very poor durability (mine crapped out at about 10k with 'cupping'). Some say that the non-BMW versions of the Michelins are more durable for this; I went with Cont's and didn't have as much of a problem as I was hearing about the MPSS (but I never really compared directly). Keeping pressure a few # higher than stock seems to help. I'm now running Potenza s007's on rims a half inch wider, and they seem to wear better despite being a softer compound; probably a stiffer carcass, and better geometry on the proper wheel size.
FWIW, this is what a few track days will do to the Conti's (April, then Sept):
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