Just for informational purposes and to share my recent experience...
I recently hatched chicks. But about halfway through we lost power when I wasn't home. The eggs were 78 degrees when I found them. I had 5 out of 11 hatch (my worst hatch ever). 1 which I culled at day 3 because it wasn't eating and something happened during lock down that I first thought was an exploded egg because there was yolk looking stuff everywhere. Well, it turned out to be yolk from the hatched chick that I decided to put down. And could by then, see that it had what looked similar to pasty butt, only on it's naval from day 1. I didn't see the hatch. I don't know if other chicks helped it out or what happened. Real point of the story though is I had 2 born with deformities, which at first I thought were missing toes. Turns out they are badly curved. And I worked hard securing quality birds and ensuring nutrition is appropriate. So I was quite dismayed to think they are throwing hidden deformities. Turns out temperature fluctuation is a main cause and so with that issue, I'm actually relieved that it may in fact not be my stock. Hopefully your full load won't have issues but now you can know if you do find a bunch that temp fluctuating might be part of it. I wasn't able to detect these anomalies until they got their land legs and started trying to peck around and stuff. But at hatch they looked just as perfect as the rest.
Learning to mark the eggs under the broody NICE & CLEAR, and NOT pencil (because it got rubbed off and I accidentally collected the wrong egg) was one of my key lessons. As noted by you and others... hens like to sneak their eggs into the nest. So you may have some late hatching chicks.
Also I misread 1 candling and thought about putting it back since "something" was different. But moved forward and checked it as part of diagnosing fertility or hatch related issues. Next time I will go with my gut and put it back.
I cracked it into the pan with all the other "blanks" that I was gonna feed out to the animals. Ugh! It was moving and had eyes that looked at me the whole time I was cooking those scrambled eggs!
It was a terrible and valuable learning experience. 
Very excited for you!
Your flock sounds interesting and beautiful.
I recently hatched chicks. But about halfway through we lost power when I wasn't home. The eggs were 78 degrees when I found them. I had 5 out of 11 hatch (my worst hatch ever). 1 which I culled at day 3 because it wasn't eating and something happened during lock down that I first thought was an exploded egg because there was yolk looking stuff everywhere. Well, it turned out to be yolk from the hatched chick that I decided to put down. And could by then, see that it had what looked similar to pasty butt, only on it's naval from day 1. I didn't see the hatch. I don't know if other chicks helped it out or what happened. Real point of the story though is I had 2 born with deformities, which at first I thought were missing toes. Turns out they are badly curved. And I worked hard securing quality birds and ensuring nutrition is appropriate. So I was quite dismayed to think they are throwing hidden deformities. Turns out temperature fluctuation is a main cause and so with that issue, I'm actually relieved that it may in fact not be my stock. Hopefully your full load won't have issues but now you can know if you do find a bunch that temp fluctuating might be part of it. I wasn't able to detect these anomalies until they got their land legs and started trying to peck around and stuff. But at hatch they looked just as perfect as the rest.
Learning to mark the eggs under the broody NICE & CLEAR, and NOT pencil (because it got rubbed off and I accidentally collected the wrong egg) was one of my key lessons. As noted by you and others... hens like to sneak their eggs into the nest. So you may have some late hatching chicks.
Also I misread 1 candling and thought about putting it back since "something" was different. But moved forward and checked it as part of diagnosing fertility or hatch related issues. Next time I will go with my gut and put it back.




Very excited for you!

Your flock sounds interesting and beautiful.
