Cecil, I'd trust you more than anybody in the world on this, but....I'd tend to use fewer, better bluegill. In other words, I'd be ultra selective on which bluegills went into the reproduction pond. Your seven-inchers may not all be created equal. Some of them will have a little better Wr's, and some will be a little prettier, or a little fitter, and I'd use those.
Bruce,
I hear ya. Thank you for the advice. So how many bgs would you plant in the 1/10th acre pond?