What pistons are you running?
Cause if your running smaller hole in the back that front that could be why..
With a smaller hole piston it makes the car 'pop' out of jumps a bit more.
Seeing as you may only have the smaller piston in the rear it means only the back might get that 'Pop' which causes your car to nose dive. Its about balance so what i would do if i we're you is move to the smaller piston up front and drop the oil up front by 5w
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