We've run QTP's for years. I had the same issue and thought it was the slicks. I would buy new ones every 1 1/2 years regardless. I switched to dual adjustable shocks, 30mm bars and adjustable sway away spring plates. Now the tire plants well and shows wear in the center of the tire. Had these on for 2 years and no problems planting!
Check the wear on the tires. The stance of the car and how it plants is crucial. I see many ppl blame the slicks (including me for a while) when it's not the slick at all!
We run anywhere from 14-17 lbs. No tubes in ours with screws. Never lose pressure or go flat.