Yes, I am going to keep humidity at 40 percent on Friday, up it to around 65 percent on Saturday, then try to hatch out on Sunday morning. That would be about 36 hours earlier than the 21 day mark. Not sure if this will help or not but I do not want them to die because the air pocket is to small or they are turned towards the small end.
The following is my hatching strategy: On Sunday morning I will score a small hole at both ends and if no blood, remove as much of the shell, while wetting the membrane, to find the beak without disturbing the membrane. If one is alive I will open a little hole in the membrane to help it breath. Same if both are alive, then put them in a warmed baby wipe and back in the incubator to wait for the veins to dry up. I already have an extra brooder lamp so that the egg/chick/chicks will stay warm while I work in the bathroom with the shower running.
Does this sound appropriate? Any suggestions, comments, hints wold be helpful.