Layers should not be fed to young birds the excessive calcium is not needed whatsoever, as a matter of fact i'll step you up a notch and say you don't necessarily need a layer at all, for instance i don't feed one far to many ages in my flock to pull that off with the ducks.
Angel wing is an odd one so many theories but not much been truly sorted on the exact causes, i am not even sure if they have yet to settle the debate on whether it exists in the wild lol
Sounds like a scratch grain is what your using, which is fine so long as it's not the main diet, i feed a grower to my ducks and free choice oyster shell, this offsets the lack of layer for the females.
Flock raiser, all flocks etc are great if you can get them. as for the angel wing there are threads on here about treating it, you can tape wings and it may improve. Genetics i think play the greatest role in it vs feed since often only a few birds are effected yet they all eat the same, super high protein maybe an issue but i think that would have to be mega high and prolonged use.