If they are at day 57, I wouldn't worry too much about the humidity. At this point, the eggs need oxygen more so than moisture. I use hova bators for incubation, and they don't hold humidity very well. I typically have to add water about once/week during incubation, but the last two weeks of incubation, I don't worry about it anymore. Once the eggs begin their pre-hatch dimpling, the shells weaken so as to allow more oxygen into the egg (and also because the babies are drawing calcium from the shells) . . . oxygen is their biggest need at this point rather than moisture.
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