Rear end bouncing/Equal-i-zer 4-point 10K hitch

When you adjusted the bars, did you work your way back down to unloaded ride height in the front, or did you hit it "spot on" on the first try?

If you got it "right" on the first try, I submit to you that you probably have too much tension on the bars. The reason being, there are "jounce bumpers" that the IFS 4x4 Chevys ride on at unloaded ride height. It is impossible to push the front end below unloaded ride height. So you may think you're right on, but you're really way over.