Shawn,. .. .Whilst I hear what you're saying, I have believed that the effects that you relate are caused by the unloading/loading of torque requirements to the tail rotor, not the Nr variation. ISTM that if you turning in the direction of the main rotor, less torque is required at the (anti torque) tail rotor, therefore with a fixed collective setting, more power transfers to the Main Rotor, thus more lift. And vice versa for turning against the main rotor.. .. .I would expect any variation in power demands due to Nr fluctuation to be quite minor in comparison.