The amount of (-) camber you have up front is all I could get out of my completely stock strut mounts. I think mine are @ -1 deg. on both sides. To get more, i'd need offset camber plates/monoballs and probably have to widen the strut tower opening in the body with a grinder.
If I recall correctly, a more aggressive setup utilizes more neg. rear camber than you currently have set.
Here's a good topic on alignment issues.
Home Alignment
There's alot more to be had from the board as well. Maybe not only this Tech. Forum, but maybe the Racing & Autocross Forums?