I would have to say 99% of people on here are not affiliated with vendors at all . I went through the same troubles as you are with my upper/lower set up when it was on the car . It always feel on it's face and hesitated in the mid to upper rpms . Mine is voltage related and it still is with only a 2.76 upper . But it seems you have figured out the problem and people trying to help you as well as tuners with years of expierence are wrong so good luck with your car and I hope you don't run out of MAF or fuel with 17psi of boost mine 2 cents .