Tie breaker that uses goals against in region play seems pluasible but I would rather see a point system using goal diff upto three pts a game come before that.
Problem for me with GA is that a team can win almost every game 6-1 (giving up 1 because they get the bench players in every game for playing time) and split with thier rival who wins almost every game 1-0 (rarely getting in the bench players becasue they have to go starters all game to win). The team barely wining them get 1st place while the other team gets 2nd. Which team really will represent the region best?