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Me too. I think ventilation is as important as humidity, but often overlooked.
I usually have great hatches on my own eggs, and decent on shipped eggs.
When you fire up the bator with the plugs out, adjust temps to this environment.
Our weather here in FL is very fickle this time of year. One day we are heating with
the wood stove, a few days later we are leaving the windows open.
Yet my bator temps stay fairly constant (Hovabators) and I just add water every couple
of days to one trough to keep my humidity averaging 45 or so. When it drops to the 30's,
I add water and it goes up to 50ish for a day maybe.
You can adjust your humidity by adding water the first 18 days,
if it runs too high, you can let it run lower for a day or two. Humidity is more an average...
You can add sponges, etc to keep it higher during lockdown if necessary.
Everyone will have different humidity needs depending on climate and
altitude, I think, but I've had the best results by not following manufacturers instructions
to leave the plugs in until hatching starts. The eggs need ventilation as much as the
hatching chicks, IMO.
Leave the plugs out, in my experience, I've gotten the best hatches this way.