Hey Elizabeth, i forgot to mention but we always puncture 4 small holes in the containers for airflow, 2 on opposite sides.
We never tried the cotton ball but it should help to create a more constant humidity, that's actually a very good idea.
Though we also experienced that clutches that are exposed to more natural conditions like temp and humidity drops most of the times might take a little longer to hatch, but also produce bigger and stronger hatchlings.
We had a few times that the clutch came loose from the surface it was glued on and we found it on the bottom of the enclosure, in that case we put them in one of our incubators, and the few that hatched in the incubator have always been a little smaller and more fragile.