Interesting observation, Jim. I was a real world pilot (in my youth!) and I always found turning left easier than turning right if flying manually. In fact, when I was training I would screw up right hand circuits because I couldn't keep the actions smooth. My instructor at the time had a few theories about this, the most interesting being that it was to do whether you were left or right handed and also the fulcrum movement of your elbow joint! In my case, my right hand on the stick travelled easier towards the left because of the position of my elbow and the ease of drawing your arm to the left. When turning right the action was pushing your arm outwards. and away, which did not seem as natural as drawing it towards you. It was only his theory, but it still perplexes me why we still have a favourite way to turn! I still like to turn left rather than right!
I guess you will get a fair few replies from RW (real world, not rotary wing) with their observations on this.