I have to ask the question WHY would you do a 40 kt EOL at 90% NR? The only reason fro drooping Nr in auto is to increase range which is clearly not needed if you are doing a 40 kt auto. All you are doing is reducing the likelihood of your survival.
After reading some of the posts on this thread it seems there will soon be a chapter in the Darwin Awards solely for 'really clever and innovative helicopter pilots whose genius was misunderstood by the mainstream helicopter world'.