Okay. Now you mentioned that you were letting the eggs "attach air cells".
How did you do that?
How do you know it has happened?
This air pocket is not attached
You know it has happened when you candle your eggs. You don't see the air pocket.The best way is to put the eggs in an egg carton and do not move them. Blunt end up. Hopefully gravety will let them settle, with the air pocket in the correct position.
This is a correct placement of an air cell. You can visably see the air pocket in the blunt end.
Correct air pockets are essential.
The chick uses moisture in the egg to grow and develop. They need the air to get ready to hatch.
How did you do that?
How do you know it has happened?
You know it has happened when you candle your eggs. You don't see the air pocket.The best way is to put the eggs in an egg carton and do not move them. Blunt end up. Hopefully gravety will let them settle, with the air pocket in the correct position.
Correct air pockets are essential.