I'm late getting in on this thread. I was trying to stay away because I just have the worst hatch rates. (0% in the incubator, 82% under a broody, 27% under a broody, 24% in the incubator, 25% in the incubator, 14% in the incubator...).
I waited until I knew I wasn't going to be sending on bad news! I have set a total of 59 eggs. 18 were shipped MF bantam Cochin eggs, 28 are my own blue/splash wheaten & wheaten Ameraucanas and the remaining 13 are my own MF and BC bantam Cochin eggs.
I set my first round on March 31st. That was 8 shipped eggs, 20 Ameraucana and 13 of my own bantam Cochins. 10 of the shipped eggs are under my broody BC bantam Cochin. On day 5 I tossed 3 shipped eggs and 5 of my own bantam Cochin eggs. I replaced them with 8 of my Ameraucana eggs, so I have another staggered hatch.
We are on day 10 and 5 and all 41 of the eggs in my incubator are still developing! If I have a decent hatch, I am going to be amazed - plain and simple.