How strange and discouraging for you...I hatch TONS of easter eggers...they are my best seller. My hens are buff orpingtons with two roosters over them, a black ameraucana and a w. ameraucana, the roos are both from show stock and the hens are hatchery stock and I have let some inbreeding go on. I feed generic feed from TSC and they get no added minerals/vitamins other then what they forage for (they freerange durring daylight hours) and I have never had a case of curled toes in the couple hundred chicks I have hatched...Good Luck figuring out what ails them!