"Korea were much better in this game than they have been, we struggled in the first quarter and they had a lot of ball which frustrated us," he said.
Averaging a blink over four goals a game was one of the high points for the world No 8 Black Sticks.
Capital striker Stephen Jenness was the most prolific goalscorer in the series with four while penalty corner striker Kane Russell, and attacker Nick Wilson bagged three each, captain Simon Child and Woods two each with one apiece for Hugo Inglis, Blair Hilton and Shay Neal.
"The ability to score goals has been a big focus for us so to come away with two big wins highlights we're heading in the right direction but we still have a lot of work to do," Collins added.
The Black Sticks now get back into training ahead of the Sultan Azlan Shah Cup in Malaysia from April 7-17, where they are the defending champions having beaten world No 1 Australia in last year's final.