Coley was on his way to China yesterday on a business trip, but dad Ron Coley attended the NSW event and said the family was delighted with the results, considering his son entered the Australian series just to get valuable experience.
"Certainly I'm a very proud father," said Ron Coley.
"What made this one so good, in the last [qualifier] he crashed, and then got back with a win. It's pretty amazing.
"He's certainly a real gutsy boy, he just loves the sport," said Ron Coley.
Driving 'Poison Ivy' with Minnell navigating, Rob Coley also had a second and a third placing during the series to finish on 147 points overall, just ahead of Welch with 144 although Mullan comfortably claimed the title with 190.
Seventeen superboat drivers featured among the final points tallies.
Last year in the New Zealand series, Coley finished fifth overall after problems with the boat in the first few rounds, but then came back to win at Crownthorpe and Wanaka.
Coley and Minnell will team up again for the New Zealand summer, which starts at the Shelterview track at Upokongaro on December 27.
"He's confident of doing well because we've got the world's [championship] here in January, in Meremere and Tauranga," said Ron Coley.