I'm really confused as to what you are doing with the eggs. From your first post it seems as though you are opening up the eggs and taking them out on day 19 because you've read they absorb their yolk by day 19. In my experience, they have not absorbed their yolk by then. They begin to absorb it on day 19 because usually they begin to breathe on day 19, and sometimes won't do so until day 20. Then they take time to externally pip, and then a while after that, will pip all around the circumference of the egg and push themselves out. You are not supposed to help them on day 19, if that's what you are doing.
You should expect for them to hatch on day 21. It is also not routine to remove chicks from their shells. It's something that is done when they have absorbed the yolk but for whatever reason, can't get out, and under normal incubation temperatures this could not be any earlier than hatch day (day 21). If they haven't absorbed their yolk sacs, bottom line is that it is far too early to even think of assisting.
My advice would be to put your eggs into lockdown with adequate humidity, and let them do their thing. Don't even touch them. I assist when necessary but the majority of eggs should always get out on their own. At this point, considering your losses, you'd be better off leaving them alone entirely even if a few weak ones don't get out.