Actually it sounds like you are to fat on the bottom and your idle it too high to compensate for the rich bottom. Normal idle gap should be around .5 mil to 1 milliliter. I would lean the bottom 1 hour at a time untill the idle stays up like you are talking about, then lower you idle screw. I normally set my bottom end on the box before I even get on the track. That was the way I was taught from Chad Phillips.