Bubba, I am curious as to the rpm's you are getting on the Saito 100 with the APC 15X6.
I also have the 66 inch 300S with a Saito 100 and a 16X4W spinning 9100 and have tons of power, but not much speed. I would like to get a little more speed as flying into the wind just looks much too slow. As such, I tried a Master Airscrew K-Series 15X6 tonight and initially got 10K rpm and dialed it back to a more conservative 9500. What surprised me is the plane did not fly noticeably faster, I needed more throttle to do the same maneuvers, and I definitely lost my up line power. Do you think the APC 15X6 would perform that much differently than the Master Airscrew?