I am a little confused about the humidity...everything is supposed to be pre-set in the incubator (it is a Hova-bator 1588). I was told to just add water to the Trough #1 and that is what I have been doing. Humidity has ranged from high 40's - to about 50%. I understand I am supposed to get the humidity higher during lock-down. Can I just add water to one more trough? The instructions are not clear to me. Sorry to bother you, but I just want to do this right!