Posted by: WingSuit on Aug-13-13 12:58 AM (EST)
Sounds like you are simply overwhelming your board. Too much mass for the displacement. Your paddling partners would be just as unstable on a board much too small for them. I think you are not going to find a board big enuf for you in that price range. You'll need a displacement hull in a 12-6 or 14 by 30, or one of those super wide planing hull boards. Try Craig's list or SUP forums to find a used board. It'll take a big thick slab of foam for you to be stable.
Cartop Kayak Carriers
Paddler's Truck Rack