Leaf spring clamps

I’m running that spring with no rear clamps and the stock front clamps. I know people who put stouter front clamps on, but I never have. (Most are not A bodies). No one runs a pinion snubber, even a 10’s stick car big block Challenger. The advice I have is video the car launching. First look at two things. How the nose tops out and then watch the tire bulge. Is the bulge consistent? Does it go away at any point? Check your tire contact mark. Is it even all the way across. You need to be in the ballpark with your tire pressures before doing much else. A run is determined usually in the first 2-3 feet. Unless you run a power adder and REALLY pour the coals to it down track. Actually, my car is pretty oversprung with that spring.