I have a couple of hens that have extremely tough eggshells. My last hatch those were the only ones that didn't hatch. They got all the way, but were unable to pip. I have had to put the one hen down (internal issues) and would really like to be able to get some of her babies. Is there anyway I can help these chicks out? How do I know how and when? I have boosted the humidity to hopefully soften the shells a bit, but I really don't think that's going to be enough. I really have to hit these eggs very sharply on the edge of a bowl to get them to crack at all... I can't imagine a chick being able to break through, and as I said, these are the only ones that don't hatch. Please help!