WotLK PVP system

Hello. My question is how does arena raiting points on warmane works. I have a 2v2 team, we are at 1520 raiting. For the past week we got only 7 to 12 points maximum. Now this thread is because we won and versed teams that were 1600-1700 , got only 9-10 points. We lost too against teams in 1600's and they got 48. We have almost 200 matches this season, how is this possible. I am not complaining, but something feels wrong. A team with 1k more raiting than us to win and get 48, and we won with teams that are almost 1.5k above us and get only 9-10 points. And when we lose, we lose 11-12 points,