Tim, I'm not sure I understand your strategy on controlling bluegill and crappie. As the medium size flatheads grow, they are going to eat more large forage than small stuff. They also become extremely hook shy. As they grow, they will not expend the energy needed to catch a bunch of smaller forage fish. They will go for the largest thing that will fit in their mouth. That includes large spawning size bluegill, crappie, bass, etc.
Now, all of the above is conventional wisdom. You may find a way to work it out. Good luck.
