You can help the bass by stocking threadfin shad, assuming that's legal in your state. Then a couple years from now when you have more bass in the 18"-plus size range you could stock gizzard shad to help the big bass get even bigger. Only stock shad if you don't care at all about bluegill size; but if bass are your passion, shad will help. Along with threadfins now, you could stock a handful - emphasis on handful, no more than five or six I would say - of flathead catfish, if you can get them a couple pounds or better each in size; it would take them a little while perhaps to get to the functional size (probably five pounds or better), but once they hit the size where they could eat the smaller largemouth, they would thin them out quickly, and keep them thinned. They probably won't spawn successfully in a pond (you don't want them to anyway); but they will get huge, and eat a lot of fish; I would never recommend them in a pond much smaller than yours. Although I have fished a couple times a small (maybe two acres) pond near me that has a few flatheads in it, and the second time I fished it I caught a LMB that would've gone between four and five pounds. The bass are anything but crowded in that pond. If you can't get flatheads, there are a few hatcheries that sell blue catfish, but make sure to buy ones at least a couple pounds in size.
I don't know if they would make it in LA, but if you were a little further north you could stock a few tiger muskie, which get big but not as big as a flathead and also only live four or five years since they're a hybrid, and are sterile.
