Options for Flattening out Mandibular Angle? (photo)

All you need is a Botox injection in the muscle at the mandibular angle (called masseter). You should find a Doctor familiar with injecting the Botox into this muscle. With time, the muscle will shrink by 2 to 4mm.

You do have a high mandibular (gonial) angle. While you are correct in that this type of jaw angle shape is more commonly seen in Class II malocculsions with a short chin, it can be seen in any state of jaw development. For correction you need a vertical lengthening jaw angle implants to lower the angle position.