Egg temperatures

[771subliminal]

I have a little iris tub that was covered with press and seal plastic wrap and the tub lid. Inside I have very wet vermiculite (pretty much mud) with an egg crate with 1/2 inch pvc pipe legs... so the vermiculite / water will not actual touch the eggs.

2.) with this setup, is there any such thing as too much humidity if the eggs are not in direct contact with the substrate?
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sorry if this is a stupid question but if the eggs are not touching the substrate why does it matter what is used, would just plain water not work then?