you could go with a little higher pitch prop like a APC they are a little cleaner in foil like a 14/10 http://www3.towerhobbies.com/cgi-bin...?&I=LX1596&P=0

one thing about 4 strokes break them in easy, and as they get broken in they get stronger, and can swing higher pitch props, there not like a high reving 2st your only going to get about 9,700 RPM but plenty of low end.

its like when I do a fly by and the engine is purring, I pull up and I wonder when its going to bog and tip and it just keeps going untill I pull back on the throttle way cool and not all screechy.

I have had mine over 3 years now at least I maidened it about this time in 2007