Randy, I vote that you use the parts you already have and figure out why their not working. Leafs will get you well into the 10's. CalTrac's are good for run-to-run consistancy...not worth the expense for your goals IMO. The shocks must not top-out! The rims probably should be wider to spread the tire for a larger contact patch. I would probably mount the front spring in the top mounting hole too. Make sure the front end is loose and has travel as per many here are suggesting. As you know, Raff can help you pretty well.