Stumped and Frustrated with a Holley 670 Hesitation

And don't confuse a shot with it's working. Some guys will move it an 1/8th of an inch for example and then see the pump shot and think it's OK.

If you move that throttle and do not instantly, as in right now, see a shot, that could be your issue. It could be as simple as a minor adjustment if you find this to be the case.