In the south a BG/LMB/CC pond will reach carrying capacity in about 18 mths post stocking. The population will continue to evolve for about another 2 years until it moves toward an unbalanced state. So in those you described the ponds were at capacity - filled with small BG and whatever else was there. From that point on you are managing population dynamics (how many of what size and type). I think you need a good analysis of what is really there in order to move toward where you want to go. Catch records , visual info , seine survey and even electroshock survey.