Offshoreorca
Whale Whisperer
Thanks so much to be honest from my untrained eye the air sacs looked small on lockdown but the humidity during incubation was low if anything (I couldn't keep it stable so kept it lower as didn't want it too high before lockdown)
You can use extra thermometers or hygrometers to see if this might help, or purchase a newer incubator if you're not keen on figuring out all the kinks with the old one. Just keep in mind that it's good to have independent and calibrated hygrometers/thermometers as even well-rated, new incubators can have issues. I've been using a Brinesa Mini II Advance and love it, but it is on the more pricy side. It's been great to have everything automated though!