ST: No reason the Puma and AH 332/225 etc would not exhibit similar tendencies, with the degree of n/rev excitation as sensed in the cockpit dependent upon the vibration attenuation system/design attributes. And as one would expect, it is much easier to find this condition and stay on point for data purposes if the wind is calm or nearly so.
LW: The maintenance test flight manuals for the S-70 models are similar and the auto Nr charts ( which are simply a cross check on collective rigging being proper on the low end ) were developed based on performing the auto at 80 KIAS and stable.