I did a lot of things differently - this mostly pertains to shipped eggs although I have some "homegrown" in there too, being treated the same way.
1) Keeping the large end of the egg up and all times, even when candleing (how DO you spell that, anyhow?). When I first checked for loose air sacs on these, the most I did was tip them gently a few degrees slowly this way and that to see if anything moved. As I can't seem to see the air sacs usually anyways, I just looked to see if the yolk bounced around a lot. In the prior batches, the eggs with loose air sacs had very mobile yolks.
2) Not using the turner in the bator, at all, ever, for the shipped eggs. To keep the embryos from sticking, I lift the whole incubator up by one corner only a couple inches, and only change the tilt once or twice a day - very slowly. I've forgotten to change the tilt a few times and I'm not letting that worry me. Not quite a "still" incubation, but definitely a couch potato-paced one (sorry, I have a bad joke tendency).
3)
https://www.backyardchickens.com/a/incubation-cheat-sheet Using Chookschick's incubation rules for humidity. I live in maritime Pacific Northwest Washington, and we don't have really dry or really moist air to worry about anyway. Also using her ideas for setting and maintaining the temperature.
4) Keeping my little black cat from sleeping on top of the bator, which moved it around, messed with the temperature setting and frankly just worried me a lot. This possibly should be Rule #1. She helped me mess up the other eggs very effectively.
5) Not opening the incubator other than to add batches of eggs or to candle at 7, 14 and 18 days. The turkey eggs are just going to have to deal with the neglect.
I checked the prior batches multiple times....
Other than trying to defeat the POs attempts to ruin my eggs, that's pretty much it. Some tricks that I've been told and am trying are not writing "hatching eggs" anywhere on the box, insuring the box (I figure the workers won't know the contents aren't insurable and will be more careful), writing "non machineable" and of course, "fragile, this end up" all over the box, lining the inside with foil to help with x-rays, and wrapping the eggs so they aren't completely sealed off from fresh air which will render them unhatchable.
I think that's it.....