As I say, it's quite a while back, but my recollection is that the nose drop was a function of the VRS rather than a deliberate input.
If the nose down was what instigated the ROD, would the airspeed not increase as a consequence? Would 10 degrees really equate to 2200fpm in a matter of seconds with 40% torque?
It seemed to me at the time that the acceleration in rate of descent was quite breathtaking - more so than an aggressive entry into autorotation.
The good thing to come out of all this for me is to keep the main contributing factors to VRS firmly in mind and avoid any iteration of VRS in the first place.
I promise, I am trying to understand...