351 PCM hesitation out of the hole

I have spent a lot of time reading the threads and I am real close to fixing all of my problems but I still need some help to get it perfectt.

351PCM hesitation out of the hole for a second when I dump full throttle. Here is what I have done:

Ugraded to EI Conversion from SKIDIM (contact gapped @ .010)
New plugs, wires, cap, rotor and coil (SKIDIM)
I rebuilt the carb (floats adjusted & parrallel to bowls)
Timing set at 10 BTC
I even tried adjusting timing while driving and it seemed to run best set at or near 10 BTC
Mechanical advance working fine
Adjusted idle mixture to highest vacum (to the best I could tell)

All of this and it still hesitates out of the hole just for a second when I dump full throttle.

I was cnsidering playing with the following:

adjusting gap on the EI contact & accelerator pump

I haven't messed with the accelerator pump on the carb other than setting it to what the manual reccomends for it to be set at with feeler gauge before install.   

Should I do either of these or look elsewhere? Could I be running too lean?   Any help woould be greatly appreciated. I don't want to start stabbing in the dark and get it further away than I am.