I have a similar sized pond in Mendocino County with a similar draw down in the summer. I have LMB,and Bluegill and have attempted to add other forage. The only thing that has survived is small quantities of mosquito fish. The bass and bluegill are pretty effective in wiping everything else out! I have very good growth and production and I would guess that if your bluegill population is healthy you have adequate forage for your bass. My pond is 5 years old and I have lots of large bluegills and a pond record of 6.5 lb LMB. I know that is not spactacular but I'm pleased and I wouldn't be surprised if there are a few larger ones in there. My biggest chore is culling the bluegills to avoid overcrowding and stunting. I have also stopped feeding - didn't seem like it made a lot of sense to keep it up, but I may start again if I notice a drop in size.
Jim