Gaston,
A lot of what you are assuming is incorrect. Its a long time since I have delved into this type of aerodynamics so explaining all the science is beyond me at the moment but from what I remember you are heading down some incorrect paths.
Your assumptions about a helo turning in forward flight are incorrect in that the aircraft does not turn around the mast. The aerodynamic of how the rotor works can and do fill many text books but for the turn performance we are talking about here, in practice it turns the same way as an aeroplane. You also mention that turn rate is directly proportional to g. This is also incorrect. If you are really interested in this topic you will need to do some deep reading. 'Aerodynamics for Naval Aviators' is always a good start. I am sure others on here can recommend some other high quality texts. Good luck and happy reading!