"We decided that a change in our game plan was needed due to the conditions. We had to shelve our plans to play along the flanks, hold on to the ball and take it up the middle," Tauranga said.
Moerewa worked hard to break down the solid Bulls defence in the first half but had only a single try to show for it for a 4-0 halftime lead.
"We had to man-up in defence against their big forwards and eventually we got a roll on and that became a telling factor in the win," he said.
He praised Davis' contribution and also singled out cousins Kiel and Justin Davies for their hard work in the forward battle.
An early second-half try almost broke Northern Wairoa's resistance but they held on to get back in the game at 10-6 before Moerewa finished them off with two more tries.
Bulls coach Charlie Selkirk was at a loss as to why his side played so poorly after such a good victory over Hokianga last weekend, but refused to blame the weather.
"Both teams had to cope with the same conditions and they were better at us at keeping the ball. We dropped it at vital times and that was the story of the game, really," he said.
The failure to complete sets had allowed Moerewa to capitalise on possession and their strong defence saw the Bulls struggle to make the advantage line.
"It wasn't a great way to finish but it was a great season for us overall. The boys were very good throughout and we're hoping we'll retain most of our players and maybe get a few more and, hopefully, add to our success next year," Selkirk said.
Moerewa now contemplate a rematch against Hikurangi next week at Toll Stadium confident if they can play to their potential they have what it takes to win the grand final.
