Personally, I'd move him back to the glass, which was probably bigger? I know they're "convenient" & used by many breeders, but personally I'm not a fan
of racks, & if I was a snake, I'd probably do the same thing...try to get the heck out. Chronic nose or head rubs cause serious infections, don't underestimate.
Poor snake... you can dab a small amount of Neosporin ointment (only the regular kind, never the "pain relief" version) on his wounds.

(are you sure the temps are correct & not too hot? -using a thermostat? -how are you checking temperatures? -is the whole bottom heated or is there a cool
-unheated- side too?)