Aron,
The problem as we can see with that scenario is that beating the plate to match at the center opening does not give the proper curvature along the length of the vanes to be truly the maximum efficiency that you achieve with an old plate that matches the impeller curvature throughout the length of the vanes, thus giving the most movement of the water through the pump.
I cannot speak for the plates and 11 bolt scenario, but I can say this from my personal experience with the 8 bolt version. The water movement is to say the least, phenomenal.
Charles
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