Having done the odd deck landing too---allow me.
As the helicopter hovers over the deck, the co pilot provides positional inputs---"cons"---to the pilot flying. Timely inputs such as "touch forward/left/right/aft/ steady" etc. go a long way in improving the pilot's ability to put the helicopter down on the desired spot on the helo deck.
The other very important guy on teh deck is the marshaller. He sees more of the aircraft than the pilots do. I would take his signals as mandatory rather than advisory.
Happy Landings!
Alt3.
P.S: As an aside (and if the moderators will permit me) here is a laugh line:
The most overrated and underrated things in the world are an orgasm and a good bowel movement,respectively. And during a tough landing on a ship it is possible to have both at the same time!!