I actually have the exact same anchor, well kinda.........
Right handed shooter: take your right hand, and make a C shape with it. Now tuck that right behind the back of the jaw bone. When I do that, my index finger just happens to land where you say yours is. I used to battle "creep" years ago, and this is what I started doing to correct it.
I eliiminated creep, tremendously improved my accuracy, feel like I'm lined up even better, and it increased my draw length 3/4 of an inch.
Rock solid anchor, followed by expansion