Lu,
The phase lag can be easily calculated, here are some approximations I did earlier (couldn't get accurate Lock numbers for the blades so assumed 8, thus the margin of error is 3 deg).
AS332 - 83 deg
SA365 - 83 deg
UH60 - 82 deg
S76 - 84 deg
WG30 - 63 deg
BO105 - 59 deg
Not a 90 deg among them! Now as to your comment about Mr Prouty and the real world - why not ask some pilots?
You could always listen to the answers as well!