The corner weighting will help but it's not as important as having a good alignment, imho. From the couple times I've had my car corner weighted the corner balancing wasn't very far off to begin with, like less than .3%. If you are going to corner weight the car do so after the springs settle. What size tires are you running? You need a lot of camber in the front to make use of wide tires, at -2 I still had problems with riding the outside edges of the fronts.