Tony:

Stay with the 4 pitch props and adjust for the motor with length of prop. My YS 110 loves the apc 17 X 4, good place to start with your Sato 120. Remember, there is always the left side of the radio. With a good power to weight setup, you should be flying at around 1/2 throttle in hover, which you will do with the 120 and UCD 60. Prop the engine where you are on the high side of the engine's rpm limits. That way, the engine will crank up freely and give you the power you need when you need it. A slow power up engine should be reserved for the pros. We are just humans. ENJOY