If that is Forest Floor it is very damp out of the bag but will dry out. To help it dry you can stir it every once and awhile. I use the same mixture. I have a large tub I pour it in to mix and then dish it out from there. I have holes in the tub to allow it to dry out.
That will do the humidity inside that hide.
As for the temps the substrate over the uth should be no deeper than a 1/4 inch. Having deep substrate insulates the heat and can create a dangerous situation. I have no hotspots higher than 88 and usually shoot for 85. Under my hot side hide you can see mostly glass as I have very little substrate there at all.
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