Okay 55 gallon tank - what type of lid? How much ventilation/air exchange is happening?
You are actually easier to bring up humidity then try to lower it. I don't use that substrate but is it "wet" to your touch?
Check out www.reptilebasics.com for heating ideas for a tank of that size. You'll need a tstat or a rheostat to control your heat source. There's a sticky on this site about lamp dimmer rheostats that will do in a pinch (but NOT as good as a proper tstat).
If the room is dry and you have an overhead light on there should be no way you have dripping condensation in your tank (especially with a mesh lid if that's what you have). How wet is that bedding?
Mike had a right to ask, I know I was going to. The way you described it sounded like it was "very warm" to your touch which would make it a lot more than the right range for your snake.