Hello I have been hatching for nearly two years now and I mainly do runner ducks. I upgraded from an octagon incubator last month to an OvaEasy 190 as I was getting poor hatches. Unfortunately, I have had the same issue in my new incubator and the ducks keep dying during the final few days of incubation.. Not too sure why? The humidity is at 60% as I cannot go any higher because it's a multistage incubator. Any ideas what it could be? I am also getting all my birds hatch at different times. They were due yesterday. I had one hatch 24 hours ago and have not had any since. There are a few hatching but they should all be coming out simultaneously? The temperature is 37.5 and humidity during incubation is 45%. Any ideas??? Thank you.