Try tightening the struts and shocks. You can find alot of reaction time in those 2 items. 51" and 4 high sound pretty good to me for IC. You could always go shorter but that would getting pretty violent. Can you compress the springs on the struts any? this would "preload" the front some. Do you have a "pro" tree trans brake? .4 tree should be no problem with this car. Seen guys have problems with 4.10 gear but the 4.30 solved it.