I will use slightly less camber on the street, but its still in the range of 2 ~ 3 degrees. I don't really care about tire wear on the street because I don't do very much street driving in the 135i.
It seems the answer to my question is just about sidewall stiffness. Tires with soft sidewalls probably need either 1) more air pressure, or 2) a bit more camber to get even wear on the track. I am assuming a dedicated track wheel alignment with camber plates set appropriately.
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