4ero,
I might have missed your point , but provided the rotor isn't in autorotation, the NR only increases momentarily because the governor controls it (unless it's a manual throttle and the pilot doesn't correct it).
However, I think that an increased coning angle would result in a decrease in EFFECTIVE rotor thrust for the same angle of attack of the blades. A compensatory increase in the amount of rotor thrust will require more rotor torque.
Jellycopter,
I tend to agree with your observation that there is a requirement for a pitch nose down to maintain airspeed. When I was a young sprog of a pilot, one of our (Puma) squadron QHIs used to make us practice flying low speed (50kts) figures of eight across a field when we were carrying out GH in strong winds. If an accelerative attitude wasn't adopted as the aircraft turned downwind, the airspeed would reduce quite markedly . I have always put this effect down to the inertia of the aircraft (negative wind gust/windshear). That's two heretics
