Tietjens said his boys had to dig deep to overcome Te Puke in the second spell after falling behind.
"It took a full team squad, with players coming off the bench, to win that. We did it the hard way," he said.
"I just felt, if we got a bit of ball and were a bit more composed, we could really get into the game and we did that and put a few points on them when we started to look after the ball.
"It was really, really pleasing. That's two tournaments in a row, so the boys are pretty chuffed, but the biggest one for us is in two weeks at the Bay champs in Paengaroa.
"This was my first time as a coach to come here to Greerton. It is a good tournament they put on here and good to see the rugby getting spread around the Bay with clubs here from Rotorua and Whakatane," Tietjens said.
"Obviously the concern is in the 15s game, with the lack of players in the central and eastern regions, but it is good to see them putting sevens teams in to build their programmes at their clubs."
Earlier in the Championship semifinals, Mount beat Whakatane Marist 26-7 and Te Puke were too good for Mahurangi by 24-0. Waikite won the Plate final by 47-7 over St Michael's in an all-Rotorua affair, with Fiji Sevens international Abbo Toroca scoring one of the tries of the day.
Tauranga Sports beat Greerton Marist 3 in the Bowl final with credit to the host club for fielding three teams, with one a very late-starter after Manurewa pulled out through a lack of players.