I just had an 83% hatch in my Hovabator 1588. My best hatch for chicken eggs before this was 25%. I have been trying different things for months to try to get a better hatch rate and I'm finally on the right track. I hatched 10 out of 12 and 2 could still hatch tomorrow- I'm waiting to see. These are mostly buff Orps and Buff Orp/marans crosses. One is a black Orp cross from a project I am working on and one is probably a splash orp/marans cross.
Here they are!
Excuse all the red from the heat lamp on this video:

Here they are!

Excuse all the red from the heat lamp on this video:
