Another edelbrock carb question!

The primaries are the only throttle bores that have mixture adjustment screws. So the primaries are the only source of idle speed/quality. If the carb is working and set right. The secondaries on the Edelbrocks should be totally closed at idle.
Also - as I said - it will never idle without a raw fuel smell because of the cam/engine combo. So if that is what you're chasing, you're chasing your tail.