Building a season try-scoring record which rivals Vereniki Tikoisolomone in Tasman Tanning Premier, the 2019 Heartland Hurricanes player Jack O'Leary got another double.
Winger Cody Davy also scored two tries for the second week in a row, while the other five-pointers were shared around.
By the second half, which was kept to a 15-7 scoreline, the well-oiled machine had seized up in the extreme cold, with dropped ball aplenty in the wet.
"The weather was absolutely disgusting like it was everywhere else, but probably a few degrees colder," said Cosford.
As well as the regular standouts, the coach was pleased with improvements from the likes of lock Joe Oakman and winger Justin Ferguson.
"They're starting to step up, some of the younger boys in the team."
Having scored a phenomenal 422 points to only 75 conceded in nine played games (plus one default win), Metro stay on the road this coming weekend when they take on third-placed Old Boys Marist (4-1-4) Ongley Park.
The only teams with winning records and a positive differential are Metro and defending champions the Feilding Yellows, who won their derby with Feilding Old Boys-Oroua 53-21.
But Cosford's primary concern for their last two games, with a bye in the middle, is to iron out the squad's work-ons, thereby lowering the risk of being caught off-guard in the playoffs.
