IDF Flat spot

[Uber Affe]

OK...I know what you're going to say...
Well, I don't really.

I 'm running a weber 40 IDF on a 1600 dualport.
It is a pain in the ***. It has a flat spot when I accelerate or when I'm just sitting at a light. Or when I start the car and I have to gas it a little before I can move. All I here is VVVVVVRRRRROOOO)OOOM!!!!!!!!
SPut sput sput...VVVVRRRRROOOOOOOOOMMMMMMMMMM!!!!!
go..and once I'm on the highway...it's ok....well untill I accelerate again.
flat...go flat go...


Any suggestions? I've tuned the jetting just right to get it this far...Is there something else I can do? Something that will help get rid of that flat spot? running an electric ful pump also.

HELP!