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I've actually had hatch rates in the 90+% (I average about 75%) range with stable humidity all the way down to 15% for the first 18 days. Maybe lower, my gauges don't read below that. I hatch somewhere around 40 times a year for the last few years now an I try every crazy idea I can find an they all work in the right environment.. The thing is that everyone is incubating in different environments. If your incubator is in a room with AC an mine is not then you will need way less ventilation or way more humidity than me. If your incubator has twice as much ventilation as mine in the same room then you will also need twice as much humidity as mine. The temperature an humidity of the room the incubator is in is really all that matters. Play with the air exchange rate of your incubator till you get good hatches. If you take the time to get that right it really don't matter what the incubator humidity is, not till lock down anyway. I have actually stopped trying to adjust humidity at all until hatch time. All I have been playing with is vents. But then, who knows what all I will end up trying later. My hatching season is just about to start.
