First track run - less than exciting....

After I thought about what I had wrote , I thought it sounded like I was implying that a double pump Holley is the answer for all bog related issues , which it is not it's basically a race carb .

In answer to your question [ quote is the issue more about the pump shot or vac sec design .

I think it's the large plenum single plane manifold ( as you have already mentioned ) and the Carters Air valve secondary design not being able to cope .
I can't think of any factory installed carter being used on a single plane manifold , the Hyper Pack is an exeption .

So what I was trying to say was if you intend to stick with that manifold the double pumper sounds like it will work as you have found out , I think it would be a good idea to try it out at the track with maximum traction .

And another thing to consider , I believe Hemijoejr is using a dual plain manifold under his dual Carter/Edelbrocks.