How can I go about reducing a High Mandibular Gonial Angle and a short chin? (Photo)

I have quite a narrow face and high mandibular gonial angle, additionally, I feel that the distance between the end of my chin and my neck is too short. I feel that my chin is already too prominent to warrant a chin implant however, so I'm leaning towards the gonial angle implants to give more width to my jaw as well as augment my jawline in profile. I'm not sure if that would influence the appearance of my 'short chin'? Any suggestions or opinions would be appreciated.