I only use my RPF1's for autocross/track so with the 285's i am running a 15mm spacer 2.5 degrees negative camber and 8.5 caster. When i am on this setup the car is near stock ride height though as they would rub the fenders otherwise.
Now for my street setup i am running Work CR-Kai's at 18x9.5 +30 wheel with a 275 on it. I currently am using a 5mm spacer making it +25 because i was hitting the caliper but will be getting rid of the spacer as soon as i can put bigger brakes on(bigger diameter brakes will actually help my clearance). With this setup i have 1.5 degree camber 8.5 caster and the car is lowered significantly.