"WRT your last comments: don't forget - in FDVRS the tail rotor could and can get caught up in dirty air from the main rotor. ALSO as and when Nr decays during VRS, this drags the TRE by a disproportionate amount thus reducing its effectiveness even more.
Do not rely on the TR helping anyone out during VRS
This so called " Vuichard Recovery Technique" seems only to be relevant to recovery during Settling with power and not FDVRS, I would suggest...............
The last thing one would want to do during VRS is to pull FULL collective power."
Interesting thoughts, TC. If the tail rotor thrust and anti-torque were compromised then I think the expected torque effect yaw would present. If not, I would expect that the TR was still effective and might be helpful in slipping the aircraft into 'clean air' without the considerable loss of altitude with the conventional recovery. I do wonder what advantage the described technique offers to just putting the nose down.
I share your apprehension at increasing power in VRS situation.