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You seem to have a grasp of it but you will always get poorer FE in the cold irrespective of whether you are tuned rich or lean (within reason). Fluids are more viscous and the wall of air you are pushing is just that much more dense.
I think the warm air could help with atomisation and allow you to open up the throttle more for reduced pumping losses but a couple of caveats. Denpending on the carb, more throttle may pull on the enrichment circuit in the carb, also get too warm and vapour lock becomes a problem. Also carbs are more prone to pinging than EFI. Lean detonation is a sure way to toast your engine.
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