Harman is in the national 4x100m relay squad, with Joseph Millar (Tauranga), Isaac Tatoa, Matthew Wyatt and James Mortimer likely partners for the Glasgow attempt, which will need a 39.50sec time to qualify.
He has a personal best of 10.42, with 10.17 the A qualifying mark in the individual 100m.
Mount Maunganui won the men's board rescue, with George Haynes and Sam Shergold heading home Midway's Taylor and Scott, with Red Beach's Chris Moors and Matt Thetford, third.
There was also a notable double from the Papamoa board relay team of Scott Cowdrey, Ben Johnston and Danny Hart, who combined to win the under-19 and open men's titles.
Cowdrey and Mason Bryant, meanwhile, ended the six-year winning streak of clubmates Johnston and Hart by winning the under-19 board rescue, an event the latter pair have dominated since the under-12 age group.
Taranaki sprinter Olivia Eaton, who competes for the Mount Maunganui club, won the open women's beach sprint title, just a month after turning 16, having won the under-16 title.
National kayaking representative Marty McDowell defended his double-ski title, this time combining with Todd Grace.
Midway won their 10th open men's surf teams race and their eighth in the last 11 years, from Mount Maunganui and St Clair. Piha's Teneale Hatton, paired with Brita Camplin to win the women's double ski.