You maybe have room for a smaller CCW, like between 2-4mm give or take. Your aesthetic problem is really just your small and sharply down angled jaw, right? If you just want your chin to look more lined up in profile, you may as well just go with an SG or chin wing. Straight advancement jaw surgery may make things worse for you. Unfortunately there aren't many options at all to treat the mandibular plane angle, other than implants and a bunch of chin wings.