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I think your 80-85 is way too high.a good temp is 70%.
Two things can happen in the egg.One,the chick can get stuck to the shell,which is low humidity.two, the chick can drown in the shell due to its body absorbing too much moisture,or not enough,or the moisture inside the egg didn't evaporate and when the chick turns to pip,it drowns.
Out of our first 12 quail eggs in the incubator these were the conditions:
1. 5 hatched successfully
2. 3 had hairline cracks and didn't develop due to that problem
3. 2 had never fully developed
4. 2 had fully developed but drowned in the shell
my solution was to make a better quail coop.I did this already by making one 7'x4' widex3' tall on 2' stilts.This solved the problem of the quail cracking the shells.We made half the floor of wood,the other half of 1/2" plastic mesh.The wood has sand on it.it helps in the eggs being laid without cracks.So one problem out of the way.
I cannot solve the problem of the eggs not being fertile. If my roo doesn't mate with one of them,then its not my fault.I can make a battery cage for just him and the one female who doesn't want to mate with him,but then the other two will not be fertile as well.I will just leave it in his court.
I have set my humidity at 70% by fine tuning my lid on my incubator.I hope to get better results this next round.
I also have an advantage,because I own my own hens and roos that are sexually mature,so fertile eggs are a plenty and free here.I have a wide variety to experiment with,win or lose,to find the best results.Not saying anything bad about yours,but mine are at no cost so the disappointment levels are not as high.
I wish I could tell you more JulieZ. But I treat it as a science.If I leave it to our broodies,then its natures deal to play.
Sometimes any incubator can crap out.I myself don't have 400+ dollars to shell out for a sportsman incubator.I have to do with what I have.Maybe there is a way you can revamp it or have other ideas how to improve it.
I know I am blazing a trail on unbroken ground by doing it this way,but hey,its worth a shot.
Gabriel