My main concern is is chatters the tires on every launch only footbraking. My feeling is it not rotating up enough to stick the back.i can't use the brake til I get it to stick footbraking. Although the front coming up like it use to would be a plus, I just can't understand why with more power, a brake, and the converter adjusted to the new power it will not stick. I've only got 10 runs on this combo so I'm adjusting most every run.