One thing that should be mentioned or at least highlighted a bit......

The pitch ratings on the props should be taken as "advice", not fact. How well a prop produces it's "pitch" in flight is very often a flip of the coin. If you've ever spent much time with a prop pitch gauge and different brands of props, you know that individual props very often don't even have the advertised pitch. You might assume that the mfg in those cases is advertising the resulting pitch, what you should expect the prop to do in the air. But then you find another identically marked prop to have yet another different pitch on the blades. You also discover props with different pitch from blade to blade. And props with differing pitch up and down the blade.

So don't take the designations on the suckers to mean anything more than a suggestion.

And if you have ever balanced many props you also know that there are reasons those babies give you such different results in use. And don't expect the modern, machine produced props to solve those problems. I just ran into a batch of beautiful, carbon fiber, machine cast lovelies that all balance INSTANTLY at a perfect horizontal in the balancer. But wait!!! a balanced prop ought to hold every position it's placed in without moving???? so these that THUNK right into a horizontal orientation have a heavy side, a VERY heavy side right? so are out of balance right? and can't safely be balanced right? RIGHT!!!

The reason there are so many opinions at the flying field about props is because they're not really very accurate instruments. You can often find the same brand, same diameter, same pitch prop that gives different performance in the air than others of its brand, diameter, pitch. If you take 'em home and put 'em on the pitch guage, and check the airfoils, and check the thickness, width, planform etc, you might discover the why of it, but you might not. And that could be because for whatever reason, one is flexing under load differently than the rest....

So "the facts" about this deal aren't going to be facts chiseled in stone. These things may be called "airscrews" for a good reason.