Moss is kinda like plant like plankton on the ocean. Usually you can somewhat control this without chemicals, just stock some Grass carp, or stoneroller minnows. Both feed on algae and aquatic plants. You might also try snails. In any case, this will provide a new food source for your bass. I'd try harvesting some of your rather large bass and several of your "yellow bellies" so that the middle range decent sized bass have a chance to get larger. You might also consider redigging your ponds, making it larger so as to allow all of the fish to become larger due to more space and more food source. Good luck.