Sooo i have been watching this and here is my take. Having a 3600 lb 8 second caltrac car that had a huge wheelie problem so we put bars on it then had a tire unloading problem we learned a lot. First shocks have to be able to get extension real tight. Afco do not get there unless you send them back and ask to get them revalved. a leaf spring set up even with caltracs and tight shocks separate. So wheelie bars come into play early in the hit. Your wheelie bars are way too long so they come into play even earlier . Calvert seams to have a hold of this by his designed wheelie bars that actually work with his caltrac bars. As the rear end starts to rotate his wheelie bars actually plant the tire harder and not unload them. If you are hitting the tires with everything you got it is all wrong for what you have. Lowering blocks even hurts it more because it is changing its leverage advantage to point that it is out of control. Put correct springs for height , shorten wheelie bars or get calverts and get shocks valved to be able to tighten more. you said that if you tighten shock more it really blows off the tires yes because your hitting the wheelie bars to early not letting it pitch and rotate. hope this helps.