Went to the track last weekend n got a new best of 13.41 @ 99.01 in the 1/4 but only managed a 1.89 60'. Anything over 8psi would spin all 4 tires. Track prep was horrible as usual at our local track. was on 305/50-20 420's. Wish i could have got a 1.79 60' like last time, would have helped with...