Lay them all flat on their sides. As the peeps turn inside the egg shell to cut or score the shell from the inside with their egg tooth they also push and kick with their feet to separate the two haves of the shell. When they pip baby chicks are weak, they are unable to stand up, step out of, leap out of, or fly out of the bottom half of the egg shell. The only reason for standing the eggs on end is so the peep is able to get its first breath of air in an un-naturally flat and level nest, also called an incubator. A natural hen's nest is cupped or bowl shaped and this keeps most of the eggs naturally pointed little end down. At any rate the hen is moving, shuffling, and turning her eggs more or less constantly. Incubating eggs in a vertical manner also allows room for more eggs in the incubator. I hope this helps. It is good the last 3 days to up the humidity. 75% humidity during piping is not too much. It may in fact be too little.