Candle them and the air sac should be tilted, put them on their side so that the lowest point of the air sac is facing up. Be sure to tell me how it goes!
Candle them right before you put them in after you take out the turner. As for the egg(s) with the air sell on the wrong end, if all the eggs you candled are like that it could be the hen they came from or a detached air sell.
Watched a few candling videos and candled egg shining my led flashlight in wide end and I saw babies moving around ....it was the sweetest thing....I have 9 buff Orpington babies