Explain what you mean by re jetted.If it was fine before,needle/seats,accelerator pump and gaskets ( what base gasket did you use?) should have corrected the problem unless you have a vacuum leak..Also two turns out on the center carb may or may not be correct.The correct way to adjust is back the screws out anywhere from 2 to 3 turns,turn in until RPM's start to drop and then back out another 1/4 turn.