Mojo Brian,

I have the aresti with the saito 72 on it and I had one hell of a time getting it to slow down with a 12X8 prop on it. I enabled flaperons so that I had about 3/4" throw and although it did slow it down nicely, roll control got really mushy at slow speeds. I wound up changing to a 13X6 and since then it slows down much better. By all means this plane is clean aerodynamically, it takes all of the final approach at idle to slow. However this is drastically improved from the 12X8. Sorry I can't comment on your size prop being as our engine displacements are different, but my advice would be to slow the plane down with prop pitch not flaperons. This is just my .02$, try both methods and see what works for you!