Has anyone tried or used one of the Perfectpitch props from CDI? Or do you know someone that has used one? I'd like to get some feedback about their props before purchasing. Our H27 currently has a 3-bladed bronze prop (12x11p) but I think it is straining the little 1GM10. I've seen, on this site, that the original was a 13x9p. Any ideas would be helpful.