Yes, it may help to do an egg topsy next time! I have learned a lot from doing them. Sometimes, the chicks are malpositioned (head down at the small end) so they can’t pip into the air cell. That can make it more likely that they don’t hatch. And then checking for too much/not enough moisture. In my case it is very common that the membranes dried out too much because I didn’t have enough humidity. We live in a very dry climate. But if you’re in a humid climate you may find the opposite. Sorry you lost the last two, but know that it is quite common to not have a couple of eggs make it, and especially with shipped eggs! Congrats on your other 4!!
Or if it's too much of a jump too from 30% to 65%-70%. I'll definitely do an eggtopsy for next time!
