Your manifold should not glow regardless.... even at and idle of 3000 rpms. To get a manifold to glow you need some extreme heat... and sending the combustion toward the exhaust manifold will do that... hence timing.
If you have a datalogit send me your map - give me the specs on your car as well, I'll take a look at it for you.
E-mail is
djwampus@gmail.com