I posed this question to some others and here is what I got:
1) Knock out factory alignment pin. If you have an ///M3 (which you do) you can swap the left and the right strut bearings, since they're assymetrical, and give you an additional 1.5 degree of negative camber.
2) I believe certain models, you can adjust the tie-rod assembly to push the bottom of the wheel out a little bit more. Used in combination with the strut bearings trick you can obtain up to 3 degrees of negative camber.
More of the discussion is here:
Camber question