So here's how many maps play out:
Team 1 wins a couple of rounds, then get stomped for the rest of the map. I sense this might have to do with a sneaky feeling of defeatism hovering in the back of players minds. Very often people just want the map to be over once they loose their X.
Often I find myself being motivated by some kind of honor to win the last round if the map goes 3:3, and I think this motivation could be strengthened by giving some kind of reward mechanics.
My suggestion is to give another incentive for who wins the map, that is the team that wins the last round before map change.
Ideas:
1. Give a text shoutout to the team that wins the map that could be like: RED TEAM WINS THE MAP. (OR GREEN TEAM LOST THE MAP/BATTLE)
2. Give a small bonus of XP, multi or Gold to the players on the map-winning team.
I believe this idea would create a higher goal other than players personal Multi, as the team SHARES a long term goal.
I believe this could lead to more and better teamplay.