Most, but not all 4v4 battles fall into clear sides. City 17 being a good example of that, as it often turns into 2 x 2v2. Helping and cooperating on 'your' side is generally better than spreading around.
As you get better "reading" what is happening in the game and keeping track of what your teammates are up to becomes more important and easier. It might be that the reason you are your teammate have won where you are is because you were only up against one player, in which case you need to make sure your teammates elsewhere don't get overwhelmed because they might be facing 3 v 2
I might add that, in lieu of battlefield conditions that are always diverse, breaking into asymmetrical sides in a 4v4 usually means one side has an advantage, usually the side with the margin advantage
See, when there's a 2v1 and a 2v3 going on, the margin of the 2v1 is 100%. But the 3v2 is 50%. That means that, generally, 2 players can hold 3 longer than 1 player can hold two. And it just makes sense when you think about it. Moving indirect fire and support weapons dynamically around a center point or two can hold on for awhile if you're only outnumbered 3-2. But 2-1 you simply cannot win any engagement sans a royal fuckup.
So create 2v1s!