I prefer nylon or plastic props unless I'm trying to achieve a vintage look. The 11X6 should be a great prop for your engine. Balancing makes some difference. Often it isn't needed.

How do you know wwhat prop to use ? Well, the prop on your plan is much like the transmission in your car. Do you want to go slow but go up hill ? Do you want to go fast, but loose climb performance and acceleration ? The mission dictates the prop within the recommended range of props the manufacture suggest. A good sport prop for the 46 is either 11X5 or 11X6. I use a 11X5 on my little Cap232. I want it to climb good, I don't care much about speed. Actually, I love the way it flys with a 11X5, you might want to try one.