Thanks for digging up that old report Aakee. The pilot, John ( Jay ) Shapley became good friends over the years. First met him when he was a Boeing Test Pilot in 1964, then later on when he worked for the FAA with Sikorsky on various programs. Sadly, Jay is no longer with us. He was a really good test pilot, appreciated by all who were privileged to work with him.
As to the charts, certainly your observation as to the data is correct. BUT, the data was flown to a target NR, or at least it appears to be. Nowhere is the collective position plotted or noted and that I think is the underlying misunderstanding about the subject being discussed.