Welcome to the forums! The bass you described is a definite sign of stunting (multiple catches in the 10-12" range). I'm not sure if its possible to have both a trophy bass and trophy bluegill pond at the same time. Since it sounds like you have a stunted bass population, that's the best scenario to have larger BG. If you want to go the bass route, you're on the right track with the culling you've done so far, In my amateur, non-expert opinion, with your current situation, the easier route would be to grow trophy BG since you already have the right size bass in place for it.
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