Do you use the edelbrock EFU fuel sump pump?. The lousy response you reffer to comes with kindo of bogging from the engine?, if so please take a look at the AFR during acceleration. Initially I had a problem like this and the AFR took a long time to get where it should (leaned out badly). After changing to a larger displacement map the AFR response improved greatly. That allowed me to use a more agressive timing curve as well so the engine feels a lot stronger and responsive.
I have mine set at 12.2 on WOT and 13.5 or so on cruise, just as reference.
I suggest you try map 5019 and see how it does. Hope it improves.