I would add a much larger water bowl. Or a few more smaller ones. Water in the air, not the substrate, is key. You want a substrate like coco fiber to hold humidity, but not to provide humidity. So you're good there. But more water that will evaporate into the air will help.
Why two CHEs? That's gonna dry things out like crazy.
Also, I would use damp, not wet, sphangnum moss in their hides to create a humid hide.
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