Has anyone tried wrapping there ceramic coated header with header tape? Did it help reduce under hood temps? Do you think it would be worth it?

Its mostly done for racing, but AFAIK it could damage the ceramic coating on the headers. Your cooling system sounds fine, I read your other post. The cowl hood should do the trick for you instead of header wrap.

this forum and you will see all the posts about header wrap, where we unanimously agree that header wrap is bad stuff for headers.

Wrapping ceramic coated headers would not be a good idea. And I do not agree that it is a bad thing to wrap uncoated headers. I ran header wrap on my edelbrock shorties for 6 years and 50,000 miles and they looked new when I took them off and unwrapped them. I ended up selling them to a guy who was ecstatic to get them because they were so clean. The key is preparation. You can't wrap bare headers. I sand blasted mine and painted them with the expensive good header paint, then I wrapped them. I'd do it again in a heart beat. If you put wrap over unpainted and rusty junk headers, thats what you'll get is rusty junk headers. If you wrap clean and painted headers, that's what you'll have is clean good headers.