RE: Plane rolls at different rates left and right?
Three things I saw in the above posts are probably combining to create what you are seeing.
1-engine torque will tend to roll you faster in the direction of engine rotation.
2-Spiral airflow probably has the flow pushing down on top of the right wing and underside of the left wing as it travels the length of the airframe from the prop.
3- the uneven roll to the left is probably due to either side and/or down thrust in the engine, or a secondary effect of the spiral airflow. It is also there in a right roll when caused by thrust angles, but less noticeable because of the faster roll rate to the right.