The most recent 3 of my 23 clutches so far this year, have had one or more hatchlings
with dorsal kinking.

I've heard people say this is genetic, but that would not explain why three clutches in
a row, all sired by different males, are affected.

There must have been an unexplained (and missed) spike or drop in temps. Maybe a
hot spot in the incubator.

I only have two clutches left this year, but as soon as both are out, the incubator will
be getting an overhaul. First and foremost, a low voltage fan or two for air circulation.

I'd like to hear ideas other have for keeping their incubators stable.