the larger fish tend to pair off and hang around smaller structure away from larger piles. if you want to catch bigger fish, this is the key. sometimes the structure is so small you wont see much at all on sonar, sometimes just the fish. there are thousands of these little " personal " piles on granger. yes, harder to find, yes wont hold many fish, yes you have to sneak up to it, but you will catch more keepers. basically if you set your sonar to fish id, and see either a fish symbol, or something on the bottom that is not " the bottom".. stop and fish it.
when you consistantly have small fish year after year, its either stunted growth, due to way too many fish in the lake or poor forage , , or over harvest of mature fish. when the 14, 15 and 16 inch fish are gone, the 12 and 13s look quite attractive. when the 11 and 12s are gone, the 10s seem acceptable. I think doing a slot limit for a few years on that lake would do it wonders.
I dont consider catching 50 fish to get 8 legal fish a good fishery.