Heat soak? Edelbrock carb & air gap

I agree with all the above and some of the possible cures, but let me add a little info to it.
When warmed to temp and under normal driving conditions I can start my car up and watch the Air/Fuel ratio go into the 17's or higher for a minute or two with an Edelbrock.
I have an insulator and a full circulating fuel system and it helped, but still there.
The Edelbrock design lends itself to heat soak, and the fuel available just makes it worse.