I am no professional by any means. I do know that it’s tough trying to fine tune the incubating. Almost feel like it’s trial and error. Once you nail a good way of doing and have success, stick with it. I’m still in that trial/error phase :p
Good luck with the fuzzy butts!
Yeah... the Marans are tough. I don’t even check them until day 14 or so. I have 4 with ?s next to them on my sheet. I think we’re on day 9... not a Maran egg, but a Barbezieux which is darker than some, is attached.
I would try lowering the humidity a bit and check/weigh them in a couple days...
I have noticed much better air cells with doing a dry hatch start. Teetering at about 20 to 25% humidity. We’re on day 7 or 8 and they’re perfect. Unlike my last two batches that had tiny air cells the entire incubation. BUT... I don’t weigh them. So I won’t chime in on that part.