Safe Hole should be made ONE DAY AFTER, not before, or when they internally pip. You need to give them a chance, They have plenty of air in that shell for at least 24 hours. Once the 24 hours is up THEN you should make the safe hole IF AND ONLY IF they have NOT made any progress...
Your getting to EXCITED and doing things to early and that's where accidents happen!!!!
Peach is more experienced as far as Correcting her mistakes, New hatchers are not so there fore IT"S important that you guys sit and wait ONE DAY after there DUE DATE before making ANY HOLES.
They have 20% air in there shell before they internally pip which is plenty...