Winning solid majority of games soloing but going nowhere. How do you get past wall of +6 / -10 in ranked?

I solo at D4/D5. I feel like I'm making decent decisions but am being punished for them.

For example, when we have AB and are racking up points and my other three teammates are defending B or even pushing C for odd high diamond reasons, I'll try to hang back on A so that they don't spawn behind us and immediately flip A. I'd rather sit there and block that spawn because it's valuable.

However, I wind up with less damage/kills/deaths than teammates and thus it feels like the game thinks I'm being carried.

And maybe I am. But not as much as it thinks I am.

How do you break through this if your style of play is not super aggressive?

EDIT: Gamertag is RJ MacReady 44