I think your main reason for the moisture levels is you are using a cement block with a screen lid keeping the tubs out of the water at the bottom.
You DO NOT need to keep the humidity up in the incubator if your using the vermiculite. Youve added too much moisture in the tubs and the bator. Drain the water out of the bottom and should help if not fix your problem.
Edit- Forgot to say that when taking temps from inside the egg tub you are causing more condensation inside the tubs as the outside air is warmer than inside the tubs. Thus causing the tubs to sweat, resulting in wet/sweaty eggs. I always recommend measuring the air of the bator as the eggs will heat up to the surrounding air.
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