For a glass enclosure, optimally, you would insulate the back and sides with some foam insulation to retain heat (the heating elements in your enclosures are what are lowering the humidity), and cover the screen with plexiglass except for an 8" hole for a ceramic heat emitter (which you definitely need to boost the cool side temperatures). An orchid bark, cypress or coconut-based substrate along with these modifications should keep humidity where you need it.
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