Idleing Issues!!!!

First off did you set the idle mixture screws with the car warm and idleing in gear? If not you need to do that. I always set idle mixture witha vacuum guage and set it to the highest reading....this will aslo give you the info you need for a power valve or in your case the metering rod step springs. Have you taken carb cleaner and sprayed around the intake and carb to check for leaks? I have seen where leaks show up when warm because of the the metal expanding and contracting. I used to run an Edelbrock carb and I hated it...never ran right. What is you fuel pressure at idle when warm? Do you have a return line? If not the fuel could be deadheading in the line and getting hot and the fuel pressure drops and this can cause a operating temp idle problem. What fuel pump are you running?