Humidity here is between 50-60%. If I don't put water in my incubator, it drops lower than the hygrometers can read (below 10%). I incubate at 30-40% humidity and lockdown I go to 80%. I can't say I'm done lots of hatches, but I do know it worked and I haven't had a chick develop and die/shrinkwrap.
I hope you can figure out the best method for your incubator. 4 hatches is quite frustrating!
I hope you can figure out the best method for your incubator. 4 hatches is quite frustrating!