Sans, just because it went faster when it was a Bell-Agusta doesn't mean that it was any better. Faster and heavier just means less people less distance. Nobody would buy a 609 if it could carry a poodle and owner to the next town.
To be fair, I never suggested either configuration was faster (better?) per-se. Only pointed out the airframe changes made by AW which appear to be a potential causal factor of these yaw events.