Close your eyes. Mount gun. Open eyes. Are front and midbead or front bead and centerline of rib (rib extension, depression between fences, etc) in transverse alignment? No. Incline head over comb or away from until they are. Given the one you're missing, I'd bet you have to incline your face over the comb. Tell your neck muscles to remember this cocky attitude. Assume the position. Close eyes. Mount gun. Are the useful lateral centerpoints aligned? Do it again. Go to skeet range. Do it again. Load gun on station. Forget everything but that neck position. Don't look at the beads. Shoot. A useful muscular adaptation and one which G. T. Garwood thought most American shooters resorted to with neutral stocks and pupils which aren't usually precisely in a plumb relationship with those little piggy cheeks.
jack