Why would the sunfish all be small? Would there be too many fish to support overall? I'd think we would see more fish if that was the case or perhaps the bigger ones do not come to feed.
Without a predator, a prolific species of fish will overpopulate the pond and become stunted.
You could still have a few large LMB in the pond, but they cannot keep up with your annual new production of BG and shiners.
Eventually you need to get some bass in there of the correct size to feast on the 2-3" long BG. That size of bass would also like the 3-4" shiners.
That will result in both bigger bass and bigger BG!
Hopefully you can collect a little more data, and then get some good advice for a fall stocking of LMB.
