No. excess moisture is a problem if the egg hasn't released enough moisture during the incubation process. That moisture is already in the egg, it's not coming from an external source. The drowning is taking place BEFORE the external pip. When the chick internally pips into the air cells. The moisture that the egg hasn't released, the liquid w/in the shell can aspirate the chick before it even taps through the shell. Condensation at hatch is too much humidity yes, but that's not the cause of chicks drowning that compromises the hatch.
Overall to answer your question, yes, if you raise your humidity at day 18 they should be perfectly fine even if they hatch out a day or too late. (The exception would be if you already had too small air cells from lack of moisture loss during the incubation period.)
Thank you for clarifying Amy. So this is why you like to use the "Low Humidity Incubation Method". Keep humidity low, measure air cells regularly, adjust humidity when needed but erring on the side of making sure the moisture can escape during incubation? Keep humidity at about 40% until day 18 and then take it up to 65%-75%.
When you had the shrink wrapping you described why did the air sack grow from the 18th day to the 20th? Was it before you came up with the Amy Styro Low Humidity Incubation Method?
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