It all depends on those air cells, if they are loose or jiggly you need to keep them upright.
Since I have this new bator and turn eggs in a "turner" the embryos do look different, they are more at the top of the egg, and I am not sure what difference this makes as far as hatchability with upright during the first 17-18 days though, I will have to research that when I have time. I am busy with a million projects right now so please remind me to dig deeper into this in a few weeks. I do know hand turning gives you a strong embryo, however shipped eggs have more "issues" than a normal local egg. keep this in mind. they have the chalaza that can fray and break too!
I use medicated chick crumbles for my entire flock right now, I will start fermenting soon again since the lower level is almost complete...
whats up with it? you cant ferment medicated feed?