Options for Flattening out Mandibular Angle? (photo)

I had a class III underbite at around 10 yrs old which was treated with braces for 2 yrs, but still have around a 2mm discrepancy. What I dont understand is I appear to have a class II relationship in profile view but with a steep gonial angle instead of an underbite appearance. I have never mouthbreathed I think to the best of my knowledge. My heritage is middle eastern but no one in my immediate family has an underbite.