Quite honestly, I don't have a humidity probe in those boxes. I use the eggs themselves to tell me if they are too dry (very rarely happens with this closed box system) and the lid to tell me if they are too wet (drops of water on lid = too wet, wipe the drops away, cover, if more form, wipe those away...gradually reduces the moisture content to perfect).
Humidity is perfect if you get a light fog on the lid. My eggs seem happiest at that moisture content. I'd rather err to slightly dry, rather than too wet. Many people soak the eggs and it can be really quite harmful to them. Vermiculite should barely stick together if you squeeze a handful as hard as you can. If you can wring water out of it, it's bordering on or over the edge of being too wet. I don't add water unless the eggs start to dent a little, like I said, very rarely is this a problem in my setup. It's much easier to recover eggs with little detriment from a little dryer condition than from too moist of conditions. Eggs die very quickly when you "drown" them.
Oh, and to answer your question, I think 75-85% humidity would be the range mine stay at.
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