So I had a bit of a play around with the coding, and unfortunately I wasn't able to do anything with the wings. The mane looks fine for me, except for during the night cycle where it looks a little brighter. I'm unsure if it's actually possible to use the ambience on the wings and the mane, I just know you can edit the textures yourself to give them a shade effect. I've also seen shaded mane mods that users have made. I'll search for some answers for you so you aren't left in the dark about it.