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That high of humidity throughout could cause them to die at hatch time. Start reading here to help understand why: https://www.backyardchickens.com/threads/is-it-possible-to-have-too-much-humidity-incubation.1181769/post-18636275

Losing power for a little while on hatch day isn't going to kill them. Having too high humidity for too long will. When was the last time you saw movement?