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You may also consider rejetting your carb. They sell one generic setting everywhere, if you're getting specific you can get as specialized as you want with carb selection and tuning. An O2 sensor added to your exhaust path will be very helpful as well. I find that to be very helpful when dialing in the carb and monitoring your advance.
A properly tuned engine will be more powerful, have better FE, and lower emissions. Plus, I would certainly recommend having some A/F monitoring before trying any major lean/rich tweaking. A simple vaccuum gauge helps out here as well.
Plus, without spending a ton of money you could look into putting an electric fan on it. The clutch fan slows down at idle, and speeds up when the grille is bringing in air. No fan can compete with highway speed air rushing in, so it's reverse of what you want. The electric keeps the idle air higher, which tends to keep you cooler at slower speeds. It at least will allow you to stabilize your cold/hot engine compartment swings. It's not uncommon at all to run hot at idle and cool off when you're moving. Stabilizing that would seem to be of benefit to your problem. And if you really want to get tweaky you can turn it off, or find one with (or setup) a temp switch to turn it off when it's not needed, which reduces the draw on the alternator. And you'll also be reducing engine drag a tiny bit.
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