Its been a long time since I studied the aerodynamics; so patience with the lay terms and my ignorance.
Is it possible that the inc. in TQ turning into the advancing blade is correlated to the coupling through the main rotor and the thrust from the tail rotor.
You could also ask the question "why do helicopters turn more easily in one direction, than the other"
Two forces to the right (USA) assisting the turn, only one through the mast for a left hand turn.
Thus it takes more "effort" for the aircraft to change its attitude left as opposed to right. Effort = Torque.
Has anyone noticed at the start of the reality TV show "The Apprentice" when the S76 does the break to the left that the tail "tucks" into the turn? Sloppy flying or something else?