Sounds like you're having fun for now. I suggest you get more people involved in the lakes management. Maybe getting the lake manager to let you have a day or two where you have your church or a group get together for fishing at the lake, reducing the numbers of fish. Fish and feed the fish like you have been doing but you need to do it more often if you are going to improve fish size. Adding fish feeders (enough to make a difference) will cost some bucks and keeping them full of feed 8 or 10 months per year add more expense. Continue fishing, add at least a thousand adult bg with them adding their babies to feed the fish. The bg need to be large enough that the one lb lmb and catfish can not eat the ones you add to the pond. Like others here, I enjoy lake management but it's on a smaller lake making it easier than managing a lake like you have. Lots of work but it's fun.
