hi,

guys i have been running a xoar 20x8 at 7200 and a 20x6 at 7700 on 5% omega and an os f plug for some time now. gives me unlimtited vertical on a gp ultimate 1.60 w/smoke. the 20x8 is a little faster in level flight but the 20x6 is quicker in the vertical lines and brakes better on downlines. the moki dosen't need to turn over 8000 rpm's to make it's power, the 7400 to 7800 range is it's sweet spot at least on this set up. i have several moki's and this is true on the 1.8 and 2.10's. when you go over 8k you get in to smaller props to turn those numbers and the motor dosen't make as much trust or pull vertical as well, just not as efficiant.
i can put a 18x8 or an 18x10 on mine and all it does is burn more fuel and dosen't preform as well.

hope this helps
brad