DISCLAIMER: There will be people who disagree with me on this who raise MANY chicks at a time, but when every chick counts I use all means possible for successful hatch & survival.
Ok...your last 2 chicks may or may not be alive at this point. The point of pipping the egg is to check for life. You only need to make the pip hole big enuf to see the membrane at 1st. If it's nice & white with a few veins faintly visible & moves on it's own, baby is ALIVE!!! If is is brown, yellow or clear & veins look brown with no movement, baby is DEAD.
If baby appears to be dead, proceed slowly with eggtopsie & watch for signs of life (movement & fresh blood). Slowly remove small bits of shell at a time to expose beak & head. If you find signs of life STOP, dampen membrane that is exposed with warm water & return egg to bator to watch for progress. If no progress in another 8-12 hours & baby is still moving try locating tip of beak & slitting membrane over beak to allow baby to breathe. A safety pin works well for this. If you get fresh blood STOP, dampen membrane again & wait another 4-8 hours to try again. Many times baby will free itself once you free it's beak & at least part of it's head & be fine. Other times, baby will die in shell. This means it was too weak to make it. If membrane begins to dry or stick to chick dampen it with warm water & work it down over chick's body from tip of beak down until chick is able to free itself. Make sure all yolk is absorbed before pulling chick entirely from shell. If yolk is still present, moisten membrane as needed & return baby to bator to wait for yolk to absorb.