Hmm, maybe try 99.5?I lowered it to 99 because my previous two batch had two eggs try and hatch too early (yolk not absorbed) at 100. I’m not sure a good temperature. I’ve checked my thermo it’s all good. But I’m doing this in a homemade inc. So idk if that also had a hand or not.
Have you checked the temperature at several places in the incubator, to see if it is consistent all over? At one point in the past, I had an incubator with a good hatch rate in one half and a bad hatch rate in the other half. (I eventually decided the problem was the refrigerator next to the poor-hatch side. It must have been affecting the temperature there.)
Good point, that small batches make it harder to tell if there is a problem with the incubator, or with the individual egg/chick.And I also only have batches of like 5 or less at this point. The highest number is the current batch at 7 eggs.
My other two batches was at 3-4 so there’s not many to hatch