Not Ranked
First off, you don't need a choke with dual quads. Second, I would start by looking for a mechanical interference between the aircleaner assemblies and the carb. Have motor running and remove/install filters and their bases/lids. I haven't seen a 600 rpm idle change due to fuel mixture alone, it is an airflow issue. Maybe the lids are forcing the choke shut and getting you into fast idle cam territory.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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