Oh boy ! You lucky dog ! I don't see me stopping here either really. hehe
I decided to stick with the 16x8, and thats because I found these Zenoah 26 specs on prop size (Benchmark Prop: APC 16x8 @ 8,700 - 8.900 rpm). Good enough for me, for now anyway, im doin 8200. Close enough... The Zenoah has a velocity stack and probably a slightly larger carb, so im not offended.