Hutchins led the way in a superb performance, winning 12 of his 13 individual events in the series, including three transtasman meet records in the process.
Layton enjoyed four wins in the 200m and 400m individual medley while Schroder and Williams each won three times.
Swimming New Zealand's youth manager Philip Rush said the series had been invaluable.
"This competition is a vital part of our development," he said. "This is the first serious international team competition for our best age groupers, and to have one of the world's swimming powers just across the Tasman is an enormous opportunity.
"Some of this group will push on potentially to the 2014 Commonwealth Games, the 2016 Rio Olympics and beyond.
"This competition has helped provide them with an appreciation of where the bar is set at the top of the swimming world. It's been a very challenging week for them to race every day for six days as well as some long distance bus travel, and it began to show today.
"They have been an excellent group and the team culture they developed is a huge benefit."
