AnFI
As a few of the posts have already indicated, you are just wrong on this. It WILL take a frightening amount of height to recover from VRS in a higher mass helicopter. And autorotating out won`t fix the problem in a hurry either, because that will also be an auto with a huge ROD. In fact, the odds are that the VSI wouldn`t even indicate the real value, because it will run out of numbers.
TT