You can utilise the extra energy from the higher Nr in the flare by leading slightly with collective - ie containing the Nr with lever. The extra rotor thrust will help reduce your RoD and forward speed as you flare but still (if you do it with care) leave you 100% Nr for the cushion. The less speed and RoD you have when it comes to the cushion stage, the more survivable the landing as your cushion has less aircraft momentum to stop.
If you want more range in auto then droop the NR but make sure you recover it before you start the flare.