I live in South Carolina which is also always humid and muggy. We run two dehumidifiers that get emptied 3+ times a day each. High humidity mostly results in late hatches but can also cause leg problems in some cases. Yours are only a few days old and it shouldn't be that big of a deal. I think it's okay for it to occasionally jump to 60-70% as long as it's not days on end. If you are still worried, maybe try opening the incubator for a spilt second to let some of the moisture out?