Why does my Dart hate a 2 step ???

Im sorry ,its a 750 Demon with mechanical secondaries .It pulls great with no bog foot braking or using the Tbrake manually .What i mean by "manually" is i mash the button bring it up to about 3800 and then drop the button and floor it at the same time.If i put a 3800 pill in the 2 Step ,mash it to the floor and let it bang on the rev limter ,with it doing the work ,it will jump when i drop the button and then bog then clear up every time ...