it doesn't matter how the air cell is.. In a natural nest, how would a duck check it? once they are wigglilng so much, they do not need to be turned any more.. they are taking over that job from you..
a big air cell is good.. that is where the duckling is getting his air from until he pips...
first off, muscovy eggs are one of the easiest to hatch..
I go with about 45% humidity for 32 days and raise it to 60% or above for the last 3 days.. this works really well for me..
no matter what you do from now on, you are not going to change the air cell a lot, if any.. don't worry about...