I’ve done pretty much what is advised for shipped eggs. The only thing I can think of that I did differently was to let them rest a little less than a full 24 hours. Only rested them for about 16-18 hours due to storage temperature concerns. They were stored point end down. In the incubator, the eggs are in a makeshift egg holder (modified egg carton) to keep them in an upright position.
I have three thermometers that are running between 99.3 and 100.2 in a Brinsea incubator. Humidity has been running at a constant 40 - 45%.
Thinking back, I actually did a quick candling on a few of them earlier on to check the air cell before I start tilting them on day 5. Of the few I candled at the time, the embryos were developing just below the air cell (as opposed to the middle of the egg like I’m used to). Not sure if this gives a clue to their cause of death.
The two that quit early on had the worst air cells, I assume their deaths were related. The older embryos had air cells that looked fine or were saddled. Other than the embryos positioned higher up than I’m used to seeing, not sure I noticed any difference with other eggs I've incubated.