Porebski and Rippey opened with an eighth but recovered well to be fourth and second in the remaining two races.
"We were a bit up and down today but our last two weren't too bad," Rippey said.
"The first day is really about being in contention so we did our job but we still have plenty of room for improvement."
All three 49er crews, as well as Maloney and Meech, had a disrupted build-up to the regatta, not getting their hands on their boats until Friday because of their late arrival from the Enoshima Olympic Week in Japan.
It didn't seem to effect Maloney and Meech, who dominated the small 49erFX fleet with three bullets. The pair are looking to improve in larger swells as they eye up the 2020 Tokyo Olympics.
"We had a really good day," Meech said. "It was awesome conditions with a 12-16 knots sea breeze and a bit of a confused swell coming into the entrance on our course.
"From this regatta, we are looking to get some race practice, also some time in waves under our belt, and today was a great combination of both."
The excellent sailing conditions should continue, with 10-20 knots forecast for the rest of the week.
"It should be pretty pristine racing," Rippey said.