OK, my point is, the plane has plenty of clearance for a "normal" prop.

I am running a 10X8, and might even try a 10X7 to see if the extra RPMs will help or if the 10X8 is the best.

Also, I am suiting the propeller/engine/plane combo a bit better than you try to claim, as I have actually tried 5 different props on my engine/plane to SEE which is actually better. I can't imagine a larger prop would do any good as every time I decreased the diameter, the plane flew even better. I have even tried multiple brands to see what is the best.

I still have not seen where you have said what prop you are running, but just that you are running a more rigerously suited prop.

And more fan area does not beat less everytime. Just look at the pylon racers. (Well, if you are into 3D, then you do want excessive fan area, but that is a different topic.)