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I'm sure you meant to say "humidity", not "temp". I keep mine at 40%-45% the first 18 days, (no water added at all, unless our area humidity drops, then I add just enough to get above 40%) then up to 55%-60% for the last three. My chicks hatch easily, with no help from me. They come out damp rather than dripping wet, not slimy or sticky. Since I started doing it this way, I have better hatches and more vigorous chicks.
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I think over 60%, in most climates, is too wet. It may reduce the amount of oxygen they're getting, i.e., the molecules of water replace the molecules of oxygen, and your chicks may be suffocating. That may be why your hatch rate is so low.
If they seem to have trouble getting out of the shells, you can still help them, so they still have a chance. But if they're suffocating, you won't know until it's too late. I don't use the red plugs in the air vents, at all. Air flow is good.
I doubt the temp is the problem, because they do fine up until you stop turning, (if I understand your posts correctly) which is the last 3 days, and when the humidity goes up. I think maybe you're raising it too much.
I bet that when your hatch rate improves, you'll get closer to 50/50 males and females.
(the females)
