Covering half the screen with a damp rag would help, I put mine underneath the foil but my foil is wrapped around a piece of cut cardboard and separate from the actual screen so Idk of yours is different.
Another thing that works wonders it to dampen a dish rag and place it on top of the hot hide, or both hides of the humidity is low enough. I do this when mine go into sheds and it works wonders. Just take them out and rewet them every few days or so and spray them down when you spray the tank. It seems like you already have moss in with the substrate, if not add some, if so add moreI mix in moss with the substrate as well as put almost like a little hedge of moss around all the edges but the front of the tank and spray them directly when I spray the substrate as well.
Idk about if the clay would dry things out so I'm not sure about that sorryHope this helps!
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