Initial results indicate success! 37.8 in the turner, 37.2 in the hatcher. Much lower airflow in the hatcher trays, and much easier to raise humidity. It's at 58% with just a small water pan.
I will make a frame covered with cheesecloth or burlap to separate the hatcher from the incubator trays, and I'll find a way to do low resistance filtration for the air intake as well.
For anyone who wants to build a 200+ egg incubator, this design, which is now much more like a GQF rather than a Farm Master, is a good basis for your own design.
Awesome!