Electric Gold Dredge Project: This doesn't even make sense!

If you've been keeping up with the electric dredge project, I made a 3D printed impeller for a 2000gph bilge pump that produced almost 40% more output for an electric gold dredge. When I swapped over to the big 3700GPH bilge pump to test the same 11mm venturi nozzle size, I was blow away by the fact that the little 2000gph pump was actually out performing the big one in this scenario! Turns out the stock 3700GPH pump needs a larger 14mm nozzle to work optimally, and even then, it's only a bit better.