I'm not the OP, but I'll share my dry hatch experience. I started with a modified dry hatch primarily because I'm lazy and didn't know any better. LOL But, my first hatch had a rate of 85%, so I did it again. My second hatch was 90%.
Somewhere in there, I started tracing air cell development...
I SOOOOOOOO want some of your ducks. I don't need more ducks!!! They are unbelievably adorable.
And here in NC, I have to dry incubate too. Sea level & humidity--it's hard to get those air cells to develop when there's additional moisture in the incubator.
Congrats on your new babies.