I would scrap the screen and just add another couple of inches of vermiculite. Place the eggs directly in it and you don't have to worry about humidity issues. What you have to remember is, vermiculite will absorb any humidity in the air to maintain the balance it needs. In order to keep this from happening you need to make it extremely wet for the no-substrate method. By using extra and adding the correct amount of water you can place the eggs directly in and they will remain full until hatching. I hatched 30 clutches of burms, indians, sri lankans, bloods and more in one season using the styro chicken incubators and this same method. Good luck.
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