Let me take a crack at it. You keep jetting it up because you get a surge at light throttle cruise, but adding jet doesn't do anything. Would the rpm's happen to be in the 1800-2200 range when it happens? And when leaving a red light, just lightly pulling away, it stumbles, but if you give it some gas it'll jump and get going. While cruising it's not so much as problem, but only when trying to accelerate from ~ idle speeds. Am I close to describing the issues?