Phew, that was close. For a moment I thought you were perfectly happy and I was contemplating of reporting you to GJ, so that he would ban you and redirect you to the jawsurgergyblog forum where all the happy campers reside (I bet most there don't even know the first thing about gonial angles, or what a philtrum is).
I kid.
I haven't even seen your frontal post-op pic yet, but if you got rid of that god-awful super-gummy smile, you're well well ahead. They may look OK on women, but not men.
But yeah, I get you about the face looking narrower. I think I have the same effect happening. My theory is that when the face is flatter, it looks wider than it is. Perspective matters just as much as actual dimensions. Another example... my upper lip looks longer that it was pre-op, but it's exactly the same length as pre-op, it's just closer to the observer now after advancement. Close objects appear bigger, and can make the background object looks smaller. So an advanced upper jaw may make the upper mid face look narrower. It's all a compromise.