The first grade team could not make it a double for the club, going down 16- 9 to Curtin in their grand final.
The ARKs seconds started into the wind for the first half.
They did not allow Curtin any room to move and the defensive pressure caused problems for the Curtin backline.
ARKs pressured the opponents with dominant scrums and driving mauls and the forwards scavenged any loose ball available.
Angus Lawrie missed a 30m penalty but was deadly after that, scoring at every opportunity.
A strong wind allowed Curtin to keep ARKS to their own half for most of the first half.
The Cassidy brothers broke the shackles in the latter stages of the half, with Beau making a break in the centre of the field and passing to Kayne who finished off with a great try.
Curtin replied with a try in the second half but ARKs pressure forced two more penalties and Lawrie put the icing on the cake with a field goal a couple of minutes from the end of the game.
In the first grade grand final, ARKS dominated much of the second half and scores were locked at 9-all late into the game.
A small defensive error allowed the Curtin backs to seize their opportunity and score a try close to the posts, which was converted.
ARKs had two trys disallowed in the closing minutes, the last one on the final whistle, and Curtin held on to win. Reon Wynyard scored three penalties.