Heat soak? Edelbrock carb & air gap

I had the same problem with my eddy on my 340. Intermittently would act like it's running out of gas on hard acceleration even with a carb spacer. I went in and adjusted the floats a bit higher and it pretty much solved the problem.
Thats something that was on my mind. Did you set them at the factory specs? I believe it's roughly 7/16 of an inch?