I tend to find that you want at least the largest the manufacturer suggests. Usually that is the right size, but for some I use more if I want to throw it around a bunch. If it calls for a .40 to .60, I go the .60. I am up a bit higher so I need the power. I also like too much power and can cut the throttle.

I tend to like saito as well. Os is good as a second. Both are good motors.