Also

You may not see any movement when candling. How do you know the yolk has been absorbed from the air cell? How many eggs are in your incubator. Did you count the day you put them in as day 1 or the next day as day 1. When I put my eggs in my incubator on a Wednesday they will hatch three weeks later on a Wednesday. I don't understand how you can tell the yolk has been absorbed by looking at the air cell. I think you should check your thermometer and hygrometer for accuracy. If you start poking holes in the egg it may help and may not once you breach the shell. Personally to me it appears your temperature may be off. I didn't see a post on what you're using as an incubator, the temperature and the humidity. They all make a difference in the hatch. If the humidity is too low increase it ASAP. I would put it, as I mentioned around 75%. The chicks need the humidity so they can turn in their shells (when you see the eggs moving) to position themselves for hatching, (pip and zip).