Whakarewarewa dominated territory and possession for the opening 20 minutes of the second spell but could not break down the resolute Tauranga defence well marshalled by the impressive loose forward trio of Carl Axtens, Hamish Gosling and Dan Crowther.
The first chance Tauranga got to run the ball into Whakarewarewa's half they scored through Hancock after sharp interplay between Evemy and flanker turned tighthead prop Jeff Thwaites.
A slick passing move which belied the dire conditions sent Philip Togotogorua in for the last try of the day to complete the rout.
Tauranga coach Mike Rogers said it was pleasing to see his side put together their best performance of the season against a very good side.
"To put it together against them in tricky conditions was particularly pleasing," he said. "Our ball handling was better today than it has been all year. It was about intensity and attitude for us. It was another level to what we have played this season.
Whakarewarewa second-five and captain Doug Edwards was full of praise for Tauranga, who he says are the benchmark of the competition.
"We didn't adjust quickly enough to what they were doing and their class showed today even in the wet weather. Precision, skill and superior systems just got around us. We fought hard to get in there and started with a quick try but they just ground us down," Edwards said.