Arm,
Please don't worry about jousting with someone with more experience. It is fun, and stimulating for both sides. But what you can't do is to post a drawing with lines at nice places and say 'here it is!" As I said, the lift vector must pass thru the CG, else the craft is accelerating on roll, bigtime.
That is where your diagram makes its most grevious error, and thru that hole passes the entire theory. It is not experience that we draw on here (pun intended!) it is Physics, and the subset of Physics, mechanics.
Considering the size of the lift as 10,000 lbs and the tail thrust at perhaps 400, (for an S76) your drawing shows a helo with a roll acceleration to the right of perhaps 100 degrees per second per second. Try to hold the stick, move the cyclic to the left and get that lift vector back thru the CG, please!
Once you do, the "rotor head height" theory will slide off into space!