Talk to a guy with some experience in racing props or just big ol props in general.
there are more theories than Carter has pills -
You start with power available and airframe to be hauled around- then you whittle or layup till you hit the best performance.
when you are close to the hub - throw away the calculator - just eliminate drag -
Q tips/ Scimitars paddles/ -on and on -
On a given plane, the engine and prop COMBO can be killer good - put it on another type plane and it is no better than a popsicle stick and rubber band.
The interaction of the airplane is all important.
The model airplane prop charts are best printed on soft , degradeable paper --