High Density Altitude Autorotations

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I fly a R22 at high DA (5000-8500ft, depending on the season) and I am looking for any advice from those who have high altitude experience (in any type) on autos at high DA. I have experimented a little, but the most part I practice the autos by the book, 65kts in the glide and RPM in the green arc. I know I don't have a whole lot to work with up here so any help would be appreciated.

I would also be interested in a explanation of the aerodynamic / energy management issues associed with autos where the air is thin.

Thanks,

Steven