Um, just my two pennies worth. I've taught on low and high inertia rotor heads (Gazelles to Seahawks) with basic and advanced students. I'm kinda against 'set piece' responses and IMHO, it is all about rotor energy management. Yes lower the collective (especially in low inertia systems) but then you have to really assess where the hell you are and how you want to arrive. A zero speed high ROD is preferable say into trees whereas, a run on would be fair on a grassy field or road.
I want to stress that these were done 'prewarned'. Use to practice engine offs in the Huey from almost any height and speed and it was a great machine....sometimes the response was to just lower the collective and accept a run on and other times, there was room to lower the collective and then get into a flare. High speed low level, cyclic back and lower collective during the flare and climb to height. But we practiced and practiced and even went with other instructors who would pull the engine anywhere anytime (but because you with the other instructor, you were expecting it).
Now in the Seahawk, we practice 'wait one two' before responding to a practice OEI....interesting to see the difference in performance compares to immediate response.
So much for my waxing lyrical.