Sounds like a 10-day candling is advisable, then maybe once at Day 18 as you're upping the humidity, just to be sure the embryo hasn't expired.
Your screen name always gets to me. Hawkeye was my first ever rooster, a big Barred Rock. He set a high bar here for all those who came after him...
I want to add that mine were in a regular auto turner in a Hovabator, that I did candle them two or three times during incubation. Only a couple did not develop, the rest hatched fine, even ones that were noted as having detached air cells when they arrived-and they definitely had them floating...
I can tell you that I had an entire batch arrive with almost all floating, detached air cells. I paid no attention to that, only noted it on each egg as I candled to check for any cracks before setting. Almost every single one of those hatched so there's plenty of hope!