How much humidity is too much?

This is a problem i am currently trying to work through with my new snake cage. I live outside Atlanta GA and its winter time so humididty is usually not an issue. This new cage i built seems to hold moisture too well! Humidity at about 80%. I belive this is a little too much. Personaly I think that 50 to 60 percent is a good humidity.

Hey You Florida folk. What methods do you use to reduce humidity? So far I have tried different substates. Paper towls seem to provide the lowest humididty rather than aspen. I also have moved the water bowls to the cool side of the cage. Anything Im missing??