The older boats dont have the fins, they have a deeper fiberglass wedge that gave them stability. The deeper wedge makes the boat keep some of the water in the middle of boat.
My cooler drains into boat too, plus people getting in and out of boat. Ballast fittings in center locker are older style(Waterbed fitting) and need replaced.
The bilge pump does not get all of it out. I think some of it is held between ski locker and engine bay.