Yea, I wasn't promoting it either (guess I should've said that) but it has worked for me. We'll see how this hatch goes. I pulled 8 eggs that weren't developing. I'm guessing they were a bit older. As I wrote in my original post, I lost ALL my chickens to the fox last week so I put some of their eggs in the incubator, so I can rebuild my flock and have part of the flock I lost.
Really sucks when 1 predator gets into a flock. I really hate the 1's that injure or kill and leave the birds. Maybe pull out the crops. at LEAST eat the bird if that's what your trying to do. I am doing what you are with my ducks, although we have got more hatchery birds for genetic div. I lost the drake and was hoping to rebuild from ducks fertile eggs. It worked and may still be.