Good to see you joining in Brother Dixson....always appreciate your input on things.
Memory serves me we had DCP (equivalent to PBA) and also Speed Trims the worked off Airspeed to drive electric rams that worked to level the airframe to reduce drag.
We had the ability to control them through the use of momentary switches and a mode switch....On/Off/Auto.
Leaving them on in Manual and landing or coming to a a hover was a NO NO...as it put a tremendous amount of stress on the Aft Rotor Shaft.