What can I do about weak Chin & Jawline? (Photos)

After visiting several Plastic Surgeons, I was told I don't need a Chin Implant. My Chin's barely on the line of where it should be horizontally (from the side view). Still, my Chin & Jawline still seem weak. I had Braces and my Orthodontist never said my anything about my bite being off. My bite seems fine to me, I just have a tiny over bite. Should I visit a Oral Maxillofacial Surgeon to ask about my Jaw? Or look into a Sliding Genioplasty? What should I do to see what would work best?

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