As an add-on to that, if you need to achieve OGE hover close to your power margins, make a level approach to the hover rather than a descending one, again without a harsh cyclic flare.
Then you are using what power you have to replace ETL instead of doing that as well as reducing rate of descent. Any tendency to 'settle with (not enough) power' is immediately obvious and a go-around can be initiated before the situation gets worse.
Brit mil teaching for power checks was within 5 miles and 500 feet of your intended LS/hover point.
Punto - the only validity of the 30 kts figure is that most ASIs don't register accurately below that figure - you can see from Nick's graph that you have to be a great deal slower than that to even get close to VRS.
The problem with 'demonising' VRS with such a huge safety margin is that pilots don't ever learn to recognise the real onset - you don't see any changes in handling at 30 kts and 300'/min RoD other than a slight vibration which is not VRS or even IVRS.