Quote:
You're probably looking for someone else's opinion on this, lol but...
I don't usually see any light at all thru the bottom of any of my eggs when I candle them and move them to the hatcher, maybe a few small areas at the top near the air cell, but never at the bottom. If a few of your eggs are completely dark, they may just be a couple days ahead of the others, and might have started developing while your Hen was on the nest for extended periods of time laying the last few eggs before she finally decided to stop laying and go broody.
If you can see the air cells have slanted in the majority of your eggs, or if you see several of the eggs have internally pipped (where the keets have pecked thru the internal egg membrane and you can just barely make out the tip of their beak against the inside of the shell) that's when I'd start lock down (OR if you see a few eggs that actually have pipped, then it's obvious).
IMO... turning them a day longer and holding off on raising the RH is less of an issue than not turning them long enough and raising the RH too soon. I've had quite a few keets hatch in the incubator, with just 50% humidity while STILL being turned in the turner and they hatched just fine, lol (funny but not funny, they coulda gotten squished in the turner!).
Your advice is always welcomed and taken in with weight. I will keep an eye out for the internal pipping even though I don't know exactly what I'm looking for, but I imagine it's a pip up where the air cell starts??? I will turn and watch a couple more days and look for any changes. I feel like it should be getting close, and I'm excited. I hope they start soon!