Since you have a boom, I would leave your main light set as it is and put a fill/hairlight on the boom and direct it toward the off side to give the other side of the face seperation and definition from the background. In my minds eye, this would really highlight the headpiece nicely.

I would have it high overhead as more of a hairlight and not pointing at all toward the the background. You may have to put a flag on the side toward the camera though

My minds eye is often wrong though