I've got a clutch of 8 eggs on day 53 now, 1 of them collapsed about 2 weeks ago (it was sitting on top of the other eggs) but the rest have remained quite firm.
According to VPI's book, this is bad because the eggs should be dimpled so when the baby makes a slit, air gets sucked into the egg and allows it to breathe. Should I cut the eggs that haven't dimpled?