Another prop that "might" be worth trying is a 13x4 APC Sport Prop
http://www3.towerhobbies.com/cgi-bin...?&I=LXFGV3&P=7
It may or may not work well for your combination, but, it's only about 5 bucks to give it a try.

As already noted, though, the "best" prop is the one that work the way YOU want. My opinion of "best" only applies to me.