It's not the pump, it's the boat. A flat bottom sled in the salt will beat ya to death in any chop. Get a sled with some deadrise in the back and you will be OK fine. Mine has a 12 degree deadrise and is fine in the salt (sound and Sekiu) and I can go on any river I want. May have to pay more attention when the flow is lower but it's no big deal.
Good luck and tight lines, Jeff laugh laugh