Hmm. I've had splayed legs from chicks that were malpositioned but didn't take a very long time to hatch (think, upside down zipper that makes it out on its own). I assumed it was the malposition (up to 7 days in the same position) and not the duration of the hatch itself that causes the problem. I'll keep an eye out for that.Splayed legs and curled toes.
Sometimes I've been able to fix them, sometimes not. Curled toes aren't as big of a deal as splayed legs. I had an adult with crooked toes and he lived a happy life. I had one with severe splayed legs and curled toes I finally had to put down. All you can do is give it a chance and hope for the best.
For splayed legs I've always been able to fix them by making a rubber band brace just above the knees, did a couple of days.