How are you measuring the humidity? I have up to 25% difference in gauges. Last 2 hatches of about a dozen eggs, I had 2 or 3 to hatch normally and the rest close to fully formed dead in the shell with lots of slime around them. Assumed they drowned. Have a batch not going and keeping the...
I have had the same experience. Humidity on the gauge runs about 20% lower than it actually is. Have you found a way to calibrate it so it reads correctly.