I don't know about your heating problems but I do know that glowing headers are normal. Exhaust manifolds don't glow b/c they are thick, headers glow b/c they are thin. A high hp engine will make them glow a little more due to "more hp = more heat". You only notice it at night when you have been running hard or long distance. My super comps glowed bright enough to cast a shadow for a little while, they cool off fast. I then coated them b/c I didn't want shorten their life, now they are cool to touch 5-10 minutes after I turn it off. Bottom line is don't worry over a little glow.
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