Those placings moved him up into ninth place on the overall leaderboard, on 43.5 points.
Overall, it was his best day in the series so far.
Corrin struggled in the first eliminator heat, finishing 15th, but came back big time in the second race, the final, to finish sixth.
At the end of the day she was eighth overall, on 51.5 points, out of the 20 female competitors.
Reigning ironman champion Ali Day (Surfers Paradise) gave another dominant performance that showcased his exceptional surf skills. He caught a wave from halfway home to win the men's final ahead of Matt Bevilacqua from Northcliffe and Jy Timperley (Burleigh Heads Mowbray Park).
It was the fourth straight win for Day in this summer's series.
In the ironwoman final, Harriet Brown (Northcliffe) led from start to finish.
Despite starting off a six-second handicap, Brown set up a commanding lead in the opening swim leg, and held on to it throughout the ski and board.
Georgia Miller (Northcliffe) took second place and New Zealander Danielle McKenzie was third.
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