I'm having problems with TOO MUCH humidity!

Just recently got an AP T8 with a divider -- I had a screen-top before, so you can image what humidity problems I had then. But, anyway, I use Eco Earth as a substrate, and apparently this stuff keeps moisture TOO well, because I've currently got humidity levels up in the 80's. One of my boys is in shed, so I suppose that isn't too bad of a number for him, but otherwise... I don't know. My experience with Eco Earth has proved that it dries out after some time, but I don't even know if it'll have the chance to do so with how well the T8 locks in humidity.

I've taken the water bowls out of the enclosure, and that hardly put a dent in the readings. So, I'm at a loss for what else I can do to subtract from it.

Are these levels okay for the time being? How long can I expect them to stay so high?