Your humidity should only be that high during shed...otherwise around 50-60% is plenty.
To the OP, change your substrate from whatever you're using to eco earth, coconut husk, or cypress mulch. Mist twice a day and place a second water bowl over the heat lamp (wash and change daily to prevent bacterial growth). You can always just make a humid hide with damp sphagnum moss and that will keep the humidity in the hide up to a comfortable level.