Damn, everyone but me seems to be able to get the floatplanes mod to work. Other than floatplanes, I don't have any other mods that affect cfg files except sub crush depth, torpedo range, and max boat range. They shouldn't have anything to do with the planes.
I manually installed the floatplanes files, and am sure everything is in the right place. Oh well. It would have been nice to have two new planes, but they just don't work (for me anyway)..