For all those wondering why their hatches failed, or why they were quitters at a certain point during incubation, I say the following.
I've had lots of failures but I know many of the reasons. Usually temperature or turning issues.
But, until you are absolutely positive the temperature was stable between 99.5 and 100.5, and the humidity made the eggs lose about 0.65% weight each day, and the eggs were turned at least 4 times a day during the first 2 weeks, you can't begin to ascertain if any of the other 20 possible culprits were responsible.
Get the most important things done first and then look for other issues.
Buying crappy thermometers and hygrometers from walmart or relying on those on the incubator is no guarantee those important things are addressed.
For the most part, no matter where you get those gauges, they are likely to only be accurate to within about 2% and likely farther off than that. That isn't accurate enough for incubation. I've had thermometers from incubator companies be spot on at 70F and 2 degrees off at 100F. I've had crappy hygrometers that I calibrated and 2 days later they were off by 30%. They went right into the trash and I got a good scale instead. RH% needed is a guess. Weight is not.
I'll get off my soapbox now - for a while.