I'm not an expert, but I would stock the full amount. Think about how small the initial fish are. Unless you think there is some reason the pond will be unusually slow to fill, the BOW should grow with the fish.
I stocked forage in March at 1/3 pool and was planning on stocking predators the next spring, but the BG and FHM grew and reproduced so well, stocked LMB and CC late that fall. Pond filled normally through the year.
For what it is worth, my experience.
