Your results with laying down egg have matched the quoted study. I've found that my hatch rate is down when the bator is super full. I'm guessing it was related to air cell size being too small.I'm glad to see you are experimenting. I was so nervous about hatching the shipped Spitzhauben eggs that I worried myself half to distraction, and decided to put the medium eggs in a cut down large foam carton. But I had 13 eggs, and only 12 cups in the carton. The laying down one hatched first. I'm sure it was coincidental, as they all hatched like popcorn and were hopping around the hatcher like nobody's business.
My other small hatches have gone great, too.
It seems that when I have my hatcher 2/3 full or more, the hatch gets drawn out and more chicks have issues. I think the next time I have a large batch to hatch, I'll divide them up among the hatchers and see what happens.
I have about 10 EEs out so far.
I would hesitate to move them after lock down date. From the reading I've done, they move into hatching position at day 14. So, in theory, one should put them in hatch position, be it horizontal or vertical by day 14. (My best ever hatch was horizontal, hand turned till day 14, then put in cartons, air cell up from day 14 to hatch. They were tilted until day 18.)OOH I like that!
Next hatch, the first dozen eggs that pip externally will be moved to air cell up. The remainder will be left horizontal. If the overall hatch duration is compressed, that would be great!