Don't mist the eggs, just pour a little water into the vermiculite mixture.
I do have a couple small holes in my incubator tubs, but GOOD LORD, did I just quote BG. When he sees that his head will be as big as a basket ball. LOL
Edit:
I just wanted to add that I think we all do this a little different. Nothing is written in stone. I will say that I observe my incubator, it's temps, it's humidity, etc just as much as I monitor my snakes.