Sliding Genioplasty vs. BSSO (Photo)

I want to know if my chin is too far back for a sliding genioplasty, all of the before and after pictures of people I've seen who have had the procedure done don't seem to have chins as far back as mine. I've never had X-Rays, but when I was getting consultations from functional orthodontics two years ago all of them told me I have a Class I occlusion... Will a sliding genioplasy put my chin in a normal position or is it too far back?