Just one more thought. P-factor and torque definitely is a factor in left hand turns especially at high angles of attack an high power settings. But why is it still easier to turn left instead of right at idle when in the landing pattern? My feeling is that most pilots are right handed. So it is more natural to PUSH the stick left than it is to PULL the stick right. If anyone has flown full scale aircraft with stick control you know what I mean. Just my thoughts after flying for more than 40 yrs. I still find myself concentrating a little more when flying right hand landing approaches with RC aircraft.