Chinook Handling
SAS,
I only used the Chinook as a handling qualities analogy with regard to the Prouty comment.
With regard to your first paragraph, it reminded me of comments made by Jim Campbell, Boeing test pilot who was at Ft Rucker 1963-4 and who signed me off in that aircraft: he had done some of the CH-47 qualification testing and related that when flown into straight ahead blade stall, the aft rotor, operating at higher angles of attack than the forward rotor ( your observation ), would stall first, the aircraft would react nose up, and the situation was, to some extent, partially self correcting.
Sorry for the off-subject diversion.
Thanks,
John