The difference in performance is due mainly to a change in pitch or diameter, regardless of the process in which the propeller was made or who made it. The CNC machining process is a more accurate way of building large quantities of propellers. However, our handfinished propellers start with a machined master pattern and are cast to a nearly net part, then cleaned up removing a nominal amount of material. Our CNC machined propellers, as well as the other guys, and our handfinished propellers are all cast and balanced the same way.
Going from a 13 X 13 down to a 13 X 11.5 should improve low end performance based on the pitch change. And going from a 4-blade to a 3-blade should also improve top speed as well.