I'm using the same method as you (no light grate) and I think too much water is probably worse than too little.
Are you using press & seal to hold humidity? I get condensation in the tubs but water seems to collect at the edges of the seal.
If the vermiculite is still clumping up and breaking apart easily, it sounds fine. If it's too dry the eggs will dimple up a bit within the first week or so, so you can add more water. Hope that helps!
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