Stumped and Frustrated with a Holley 670 Hesitation

Hi fellas, Im about ready to pull my hair out. I've been struggling trying to figure out why I have a hesitation on my secondaries when I go WOT.

Here is the set up

LA360, Air Gap, Holley 670 street Avenger, stock jets, 6.5 power valve, 31 squirter, XE268 Cam, 3:73 gears, 2800 stall converter, HEI ignition.

I do know my secondaries are opening but like stated there is a hesitation. I tried swapping all 3 of the springs and nothing made a difference. I was running a 1 inch carb spacer, I could go WOT and the car would nose dive then the secondaries would open and it would take off. If I eased into WOT there was no hesitation at all, but I couldnt just stomp on it.

I decided to remove that 1" spacer and install a 5/16" insulated Eddy spacer. I got everything back together took the car out for a drive. I opened it up to WOT and the car almost died, almost sounded like gurgling from the engine. I let off the throttle and eased into it like I did with the 1" spacer, it seemed doggier but they would open. Then when I let off the throttle to coast I heard a woosh of air. It was fast so I did it again and sure thing a woosh of air. It was high pitched almost like a turbo woosh.

The only thing I changed was the spacer and back to the stock spring that came in the carb. I bought this carb as a reman from Holley and Im wondering if this is the reason someone else may have returned it, but Im willing to try any suggestions that you guys may have for me.