Opened egg too early need help

[NatJ]

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.

Hmm, maybe try 99.5?

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.)

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

Good point, that small batches make it harder to tell if there is a problem with the incubator, or with the individual egg/chick.