Well, I'll give it a shot. My best advice is to focus more on humidity, fill your trays and maybe even place a wet rag near the egg. Then lock it down and don't open the bator/touch the egg anymore, hard as that is to do.
Others may have better/more advice. Goo luck and sorry you only had one to make it. Can you get a friend for him/her? What is it that you're hatching?
Not opening the bator is going to be an extreme test of my self control, because I really want to see when it's pipped internally!!
It's a little Pekin. I have one drake and one duck as pets, this is their duckling. My duck has gone broody twice now and just gave up within a few days of when they should have hatched. I really wanted ducklings though so this time I collected the eggs to incubate them myself. That's the only reason I don't want to get another duckling right now, I want to make sure I don't end up with 3 drakes and one female lol