Gisborne turned on beautiful spring weather, participants enjoying clean waves of up to one metre and brisk offshore winds all weekend.
The groms took part in round-robin competition, followed by semifinals and finals.
Diminutive natural footer Stenzel was the star performer in the finals, posting the highest heat total of 13.26 points out of a possible 20.
Ashill led his Ocean Beach Boardriders Club to third overall, helped by Indi-lee Ruddell, who was third in the Y6 and below girls division.
Team runners-up Whangamata Boardriders secured two finalists — India Kennings (second in the Y6 and below girls) and Pia Rogers (third in the Y7/8 girls).