There are twi options for making a more v-shaped chin, intraoral t-shaped osteotomy (mini V line surgery) or a submental chin shaving technique. Each method has their own advantages and disadvantages.
Performing double jaw surgery is rather invasive, and is performed by an oral surgeon in a hospital setting with an overnight stay at the hospital. Probably best to just start with the rhinoplasty procedure if the dorsal hump bothers you enough. A closed rhinoplasty approach can accomplish...
You did not say how your chin reductions as done but, by your symptom description, it probably was done from an intraoral approach. When the soft tissues are degloved and the supportive chin bone reduced, the soft tissue chin pad can droop (slides off the bone) and looks fuller/heavier since the...