I'd stick some secondary jet extensions in there first, it just might be the problem.
Under hard acceleration fuel wants to climb up the back of the fuel bowl. Jet extensions will help ensure that the secondary jets stay in fuel at all times, also make sure the float level is right at the bottom of the site plug, if you take out plug no fuel should come out but if you wiggle the car a tad, fuel should spill out easily.
I assume your using a single plane intake, what brand?
You may be at the max operating range of the cam and or intake.
Just a thought.