I have always been struck by the high groundspeed at touchdown at high DA, due to the TAS / IAS relationship at altitude. There is always merit in having some fwd speed to increase the amount of rotor thrust available to cushion, regardless of DA, and as previously posted, there is less pitch angle available for the cushion because you have to contain your RRPM in the flare.
I think zero speed autos at high DA are high risk, and best reserved for when there is no alternative due to obstacles - ie a real power loss. If you keep some fwd IAS, your ground speed is a lot higher than you would expect, but you will have more margin to cushion.