Farrah no way. I'd have Tafua at fullback. He's not that bad under the high ball and his runs will be even more damaging with some more speed from kick returns.
Maybe Wolfie at fullback is an option also and have Hiku on the wing.
After reading Hiku's player profile I'd have him at fullback as he is a fullback not a winger out of position playing at fullback.
He's Bio say's
Very damaging runner who played wing, fullback and five-eighth for the Warriors Toyota Cup side in 2012. He stood out in every position, distinguishing himself as the Warriors' U20s Player of the Year and earning a spot in the Junior Kiwis. Addicted to breaking tackles, his metres for 2012 were only topped by fellow Sea Eagles signing Ligi Sao.