Immediate overheating... with in 1 to 2 minutes of warm up... bad enough to make the header pipe glow red.

Check fuel mix for being too lean. It will run hotter. If you are caning it around, they will glow.

that can not actually on the battery, check cooling water, oil check ...
it could be that the head gasket has been destroyed.
of air filters has not hurt the testing pass muster(has not distoid this).
diagnostics for a better one, we need more information.
nice greetings from Germany

The header pipe will glow red when you run it on choke, during warm up. This is normal while sitting. You shouldn't see that one you start riding it though.
The coolant drip could be just a dirty or failing radiator cap. My bike will push a little out if I completely top it off full. Hope this helps.