you should have had premolars extracted in your lower jaw to create more overjet to get a larger advancement.
a premolar is 6-7mm wide, so you could have gotten 6-7mm more mandibular advancement which would have been spot on i think.
caveat: your bite would be worse than it is now, but you'd look better.
to be fair though: the surgery was a definite improvement looks wise and the function (bite) looks excellent on your ceph.
you could still get chin wing with a bone graft from the hip to fill the sublabial fold.