Sorry it has been a couple of days since I have been on but about the humidity of the incubator, every incubator is different even in the same models( not as much between different makes and models) but yes they all require different levels. I run mine at a high level because the first two hatches I had with my incubator I am using now. During lockdown I was losing most of my chicks and ducks due to the inter liner shrink wrapping to the baby's and killing them( about 25% hatch rate out of fertile eggs with candling before lock down. Now with keeping the levels up I have 75-80% hatch rate. Hope this helps also I have heard and watched videos of people doing "dry incubation" where you put 4 cups of water in at the very first and don't add any water until the lockdown and adding 6 cups at that time and having high hatch rates with this process. It's sad to say but trial and error is the best way to find out where and how your incubator temp and humidity needs to be. Can take you couple of hatches to find out where it needs to be at.