Duckling with wry neck what do i do?

[DeerFox03]

I have a 2 week old duckling. After he hatched I fixed up his neck and after a week and a half his neck was normal but now he throws his head back and it's worse than before. He can clean himself, eat, drink, and sleeps normal. He can move his head and neck normal and do anything the other ducks do but he still throws his head back most of the time. I tried more supplements and more work on his neck but nothing seems to work. When he does throw his head back he starts running backwards and his tub mate, who was in there due to unrelated injuries, gets behind him to make him stop every time. Idk what to do anymore besides wish the best of luck and hope he survives

 

[nuthatched]

https://www.backyardchickens.com/articles/niacin-deficiency-in-waterfowl.75862/