You best long term option is to replace the screen lid with a homemade lid that is completely sealed aside from the hole for the light fixture. This will help a LOT. You can use just about any material for that, plywood works well and ots a very simple project.
In the short term id wrap up the screen lid with cling wrap or aluminum foil. That is safer then using a damp towel in my opinion, as a constantly damp towel is a mold/mildew concern.
The combination of your screen lid and CHE basically is a moisture vacuum, it will suck out all the moist air pretty much immediately.
A substrates change wouldn't be a nad idea. Aspen doesnt hold up well to regulare misting. I like cypress best when I need a humidity boost personally
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