On the e46, I used to run 2.25 degrees negative in the front and 1.5 negative in the rear. I also ran 0 toe in the rear and some mininal amount in the front. The settings worked really well in the front where my street tires (PS2s) went around 20k miles and my track tires wore evenly. It was a different story in the rear where I would eat a set of PS2s in about 8000 miles with more wear on the inside. I wore the track tires very evenly in the rear at twice the rate of the fronts.
What were the camber and toe settings on your car before and after?
I think I read that Dinan has something that can get you more negative camber in the front. 1.8 isn't very much for a combination street/track car.