You might also try different spring perch pads. Getting thicker ones will raise the car, but retain the benefits of the aftermarket springs. I am running SRT-6 springs (on stock wheels and sized front tires), but the weight of the M113K engine setup makes for very occasional contact on big bumps. I am thinking about swapping in the original limited spring perch pads, which are substantially thicker than the SRT6 pads to raise the front end just a tad. I've had no discernable issues in the rear.