Car Bounces after 60 ft. What is causing this??

i don't run leafs but from the video it looks like his shock are at full extension before the car even leaves and when the weight comes up in the front it is not rocking back because it has no where to go. Thus the tire is trying to pick up the car from a bad leverage point because of the poor transfer of mass to help it plant the tires and move forward not up. This equates to loss of power, tire slip, and your tires loading and unloading. My unprofessional opinion is it is all in the leafs, pinion angle, and shock on the rear. The tires and their pressure will have littler to do with your issue... to much air tires spin... to little air you get great first bite until the unload.