If you search the site, you can probably find the step by step instruction on how to do this on Atomic Neox binding system. Though the actual things you do might change, the theory is the same. There is also plenty on how to find the center of the running surface and find the ball of foot location on your boot.
I have also found that on some bindings, there is more rearward movement than forward. I think once you get to around a size 10 or 11, they must figure you don't need to be as far forward as a size 8 because for the larger sizes, the rear binding move further back than the front goes forward. Not only is the BOF behind the CRS, the manufacturers mid line mark on the boot, is behind the ski manufacturers mid line mark on the ski. Discovered this when letting a friend borrow a pair of skis the wears a 29.5 boot. Same issue on the Atomic Neox and Marker Comp/Piston plate. More obvious on the Piston Plate as there are three sets of holes for the toe binding and around six for the rear binding.
I'm sure there is some reasoning on a hoof that big belonging to a body that is rather large and there isn't as strong a need for them to be more forward.