Getting bitten doesn't hurt. Also, do you really HAVE to dangle the frozen rodent around? Have you tried just dropping it in there and seeing if it's eaten?
EDIT: Capital letters go at the beginning of a sentence and for proper nouns. Please use them this way, it makes your posts easier to read.
EDIT 2: You should just use the heat mat all the time. The lamp sucks out humidity and works the same as the UTH. Be sure to use a red/black bulb instead of a white one if you keep using the lamp.