The Key trick to fixing it that Kev told me is to make sure the longest toe is aligned with the leg. That made all the difference. Can you post pics?
As for the singleton hatches, I have found personally that eggs don't seen to hatch so well at the end of the season. Maybe fertility, maybe due...
I had one like that that got fixed with a splint. Did not put on splint for about a week (ie after other methods failed). It is 100% normal now. Don'y give up!!
Before:
splinted with garden wire loop and tape:
Just after splint was taken off. It was on for about 5 days think
Chick is...