I think if you are fishing, you really need to be actively rowing most of the time to make the adjustments necessary for good drifts and setup. There's no way to fish and row, there is too much going on and in the way. In a one man pontoon where you have fins to control you then it works. You are better off spot hopping from place to place to areas you can't access by foot and stopping if you both want to fish more.
If you want the most buoyancy and are set on the Cats like you sound like, get a pair of Sawyer ash v-pro blades which you can get in the size to put on those. All wood blade is going to float more.