Double jaw surgery or just bottom? Orthognathic surgery (photo)

http://www.realself.com/question/toronto-long-face-syndrome Here is my previous post with pictures of me I have an underbite and it makes my face seem extremely long. I have consulted with a few doctors. They are planning on moving my bottom jaw only back 10mm on the left side and 3mm on the right side. I've had braces for 5 years so all my teeth should be aligned after the surgery. I've noticed in the x ray of my skull my whole mouth is extremely protruded. What surgery do I need?