Briant and his navigator Hoogerbrug were coming off a third and fifth in the first two rounds, sitting in fourth place overall.
He said they had been “reasonably happy” with their qualifying runs on Sunday.
“The boat felt good.”
The course at Hastings was technical and they had been improving ahead of the top-nine run-off, he said.
“We needed a flawless run and I made a couple of mistakes.”
There wasn’t much between the top teams and one or two corners could make quite a difference, he said.
Waikato driver Glen Head and navigator Hayley Todd from the Altherm Jetsprint Team were first, as they were in Round 2 at Meremere last month.
They lead the championship, just ahead of Rob and Ange Coley (Poison Ivy), from Whanganui.