Well i'll be interested in the responses to this thread, as i seem to be one of the swingers Lagster's talking about. I had a lesson with an AI last week and seem to have this exact problem and it was causing unwanted fades.
I was told that if it didn't happen naturally i should do it consciously. I was also given a drill to swing with my right hand only with a bungee cord attached to the location the ball would be.