hesitation at 2200 rpm???

[ol65cobra]

I have a new 392 in my shell valley and I have geood performance at idle and WOT but at slight acceleration I have a hesitation or surge (where it seems to fall on its face for a second) at about 2200 rpm. I have a 750 dbl pumper. I adjusted float levels, adjusted idle mixture to max vacuum (14 inches) at 900 rpm, changed jets from..72, 74, 76, in promary and 78, 80, 82, and 84 in secondary. I have used squirters from 25 all the way to 40 and used all the pump cams. I am pretty sure my problem isnt carb.....Oh, I used the following power valves...9.5, 8.5, and 6.5 and none changed the 2200 rpm problem. my timing is 38 degrees full advance and its the ford dist that comes in the 392. Anyone have a clue???????? PLEASE HELP! Its a crate 392 and I cant get rid of this 2200 rpm problem.......Its only under mild or light acceleration like I said under full power its no problem but when I lightle take off from a light right at about 2200 it lunges forward and the tach drops a few hundred rpm then picks back up. Any ideas??? Is it carb???? Ignition curve??? I am most desperate!