x2 on what oregon blues said. Ducks are supposed to do better on their sides for incubating. Hatching in cartons is supposed to be helpful though. It keeps the eggs from rolling and knocking into others, and gives the hatching baby some stability. You just cut out the bottoms of cartons for airflow and stick the eggs in there fat side up.
I mist twice a day, when I turn in the morning and at night. I just spray them and candle and put them back though, not actually leave them out to cool.
If I ever incubate chicken eggs I'll use them. Duck/goose eggs are too big though, my incubators short so I'd rather have them on there sides, not so close to the heating element. And I don't want to mist them in the carton and get it wet, and they'd get colder from being taken out and misted than me just turning and misting.
The whole carton holding them steady to help them hatch makes a lot of sense to me though, so trying that.