1-2" in front of the trigger guard. I did some VERY deliberate testing and that gives me the best groups off my sand filled leather bunny ear bag. Coincidently, it does balance there well too.
I like mine about 2 inches from the trigger guard (4 inches from the trigger). To me, it makes the muzzle a little heavier for off hand shooting so I can rise to the shot.
With my stock and scope combination, the balance point of my CFX is 6 inches from the trigger.
I am going to add 1/2 inch to the length of pull and thicken the comb. Since it is a plastic stock, I can't add any cast to the comb unless I add material to the interior of the stock. When I lengthen the pull, I will add some weight to move the balance point back. I haven't played with the weight yet.
I haven't tried shooting mine off a bench yet. Just using a supported forward hand from a sitting position.