Just wanted to update and get some more feedback. So I still only have two eggs pipped and today is now day 22. One egg which pipped has slightly largened the hole and is chirping so seems okay, if a bit slow. The second egg which pipped has not advanced at all and the pip doesn't seem large enough to let air in, it is still just a crack. The twins and the last egg have still not pipped. The last normal egg was moving alot over the past few days but has now stopped suddenly and shows no sign of a pip.