I only have CAI, and Nitto DR's (17 x 275) and have hit 13.2x fairly consistantly. Like others have stated a good launch is huge. I have have hit 1.8x 60 ft. just about every time I break 13.30.
I try to have 12 - 14 psi in the tires, need to have the nittos plenty warm too. I try to drop...