as I said before, I don't know squat about the Robinson design. My experience with this phenomena is with the AH-1 series aircraft. The right roll is the result of T/R thrust, and yes, if you unload the tail rotor as you push over you can minimize the roll. The problem with that technique (which was explained to my 20 yr old brain by an aviator who had more time flying than I had alive) is that you are way outside the envelope and potentially millimeters away from main rotor separation (mast bump)as you try to match thrust.