Chad,
Weigh and measure every bass you get your hands on, regardless of whether or not you remove it. Compare EVERY bass to standard weights for that size class.
As you do what you are doing, you'll see a shift in relative weights, one way or another.
That will tell you whether what you are doing is working or not.
The direct answer to your question in this thread is, "No, you can't stock too many bluegill" into that environment.
Worst-case scenario, regarding that question, is if you over-harvest your bass...then you could POSSIBLY become bluegill-heavy. If so, you can move some larger bass from your other ponds to re-balance.
