If you're healing good and not ranking up then it's because you are teaming with the wrong people.
What I do is solo queue then at the end of the match, if we win, I invite the best dps player to my party and go in as duo. If we win a few in a row I send them a friend request.
I gone up like around 650 points in the last week doing this, currently around 3150.
Damn good idea.
Also down for some Discord games. If anyones ever around.