Popsicle sticks worked like a champ for me. Place 4 popsicle sticks on face, between outer and inner covers. 1 on every side. I also opened up the bottom entrance a little for cross ventilation. As soon as I did both of those things, moisture disappeared . If you need even more ventilation up top, use thumb tacks and you can set the height of the gap.
I swapped out my moldy covers with clean ones and gave the moldy covers a generous wash with bleach; once they are dry in my attic and there's no bleach odor, they will be ready for another installation.
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