I installed a JD jet kit over the weekend. I put the blue tipped needle in on the 4th notch (the way it comes from JD jetting). I installed the 172 main jet as recommended. I also installed the fuel mixture screw as well. Set it at all the way in then back out 1.5 turns. I run the stock exhaust. My problem is it is still hesitating when I blip the throttle or go to take off. I played with the fuel mixture screw both out and in and it only seemed to get worse both directions. Any suggestions?