Green Screen Issues

SaxyDawn Posts: 6 Just Starting Out

Hi. I hope someone can help me. I have a large green screen behind me with a 3 light set up - 2 for the side and one overhead. I ensure that there are no shadows on the green screen. I use a Zoom8 camcorder to film. I film my playing of my saxophones. I don't seem to have a problem when I film playing my brass coloured saxes but my baritone is black and I cannot get rid of all fuzzy black on the sax when I use the Keying hue & rgb function on HitFilm Express. Can anyone give me some advice?