Some use bandaids, I used a small strip of vet wrap. When caught as day old chicks, it's usually 3 days to my knowledge to fix it. Since this one's over a week, I'd keep doing the supplements but I would shackle those legs the distance they should be.
Are you sure it doesn't have splayed legs? If caught fast, that can be cured. Eight days I'm not so sure, but I'd still try.
Otherwise, do you have a picture or video so we see what you're dealing with to help better?