Comments, please!
OK, I've read all the posts. I have one question that bothers me a bit.
Higher RRPM gives a greater rate of descent. So, in the flare, wouldn't the best practice be to not build up too much of it? That gives a better arrest rate of forward speed, which, in turn, reduces the risk of rolling over.
Some of my instructors have practiced this and made the autorotations at very low RRPM - in a 206 90% and 90kts - which takes you a really long way past your expectations, followed by a long flare with a fairly high amount of collective pitch and a really smooth touchdown with zero forward speed. Just before touchdown, the RRPM has been a bit below 100% indicating a slight buildup for good margins in the actual cushioned ground contact.
I understand that this is not possible to the same extent in helicopters with low inertia rotor systems, but at least not build up RRPM to the red line or above.