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I am horrible with measuring stuff but that sound right. You don't wait the sac to be to huge as that is a sign of not enough moisture and can affect the size of the chick and could lessen chance of hatch. There is an old thread that shows with pictures the different stages of chick egg. Duck...

It may not have anything to do with the health of the parents. Sometimes you get babies that just fail to thrive that can come from strong parent birds. You can do everything right and they still not make it. It is sad though as we naturally want the babies to all be healthy.