1400-1500F isn't high at all given the MPH... I'm impressed. I've seen trucks with programmers have EGT's that high and they only trap around 98-102 mph.
My buddy with the Dodge in the low 11's runs 1800-1900F at the strip... and sometimes 2000F when at the tractor pulls.
I figured you had done something to the trans. The simple valve body mod / pressure kits usually will start throwing P07XX tranny codes at around the 140-150hp level and the converters aren't too far behind that.
Who did you get the tranny from? (BD, Suncoast, etc?) or did you have it built locally?