ec90t, as far as I know, I don't have any deficiencies. I use vermillion because it seems to help me against a green background. I was considering pale yellow, or a light gold thinking it might also be helpful on a dull day or late afternoon. My frames are Randolph Ranger.
A very light yellow or light orange works best for me. Decot also offers a non reflective coating. The coating helps eliminate the reflective "fuzziness" of the lights on your bead and the bird. Well worth it if you shoot in night leagues, etc.