I incubated in the carton, then laid it down at lockdown. The air cell looked good, it was shaped well and it re-attached. I just wish my hatching rate was getting better, instead of worse. My first hatch I had 10/12 hatch, and all 10 of them went into lockdown. One clear and one blood ring. Now I'm lucky to get 50%.Hugs! I know what you mean. Do you incubate them on their side or upright in cartons? I have had better success in cartons when I leave them in the upright position all the way through hatch. It's an art to learn, don't give up but take a break if needed.