If you're below 30 kts you want a slight check back if you are going to attempt a vertical engine off.
Vertical EOL in a Robinson........no thanks
Better to pull the cyclic back than to shove it forward which reduces Nr and, on Robbie type helos, can lead to mast bumping or tail strike if combined with a rapid lowering of the lever.
Surely most crashes due to low Nr are due to the poor inertia characteristics of certain rotor systems and a lack of practise in PFLs - if you don't lower the lever you will never recover the Nr.