Hi and welcome to the forum. What's the size of the tank you're using?

This link is a good start on how to properly set up a glass tank:
http://ball-pythons.net/forums/showthread.php?t=201740

In regards to the drying out the snake rumor, it's not true. Ball pythons do need humidity but they need heat even more. So if it's between heat and humidity, for now, choose heat.

If you can, take a photo of your setup and post ip up here.

Also, do you have a thermostat for your heat mat? Without a thermostat, heat mats can get very hot and can burn your snake.

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