Have tried APC 18x10, 18X8, 16x8, Top Flight Power Point 18x10 and a old Dynathurst 18x10.
THe Dynathurst was by far the worst and heavy too, the APC 18x8 was my favorite, had the best air speed but I broke it before I got the scale. Have more ordered, will do more testing when they get here.
Strange thing is the Ryobi turns 7000 rpm with each one, no change in rpm with a prop change.
I think it needs a bigger carb to get more rpm with the smaller props.