From how I'm reading this, your friend was hesitant and played defensively because they didn't want to screw up on a 2v1 or 1v1, that and you had an underlight teammate who was playing aggressively but kept failing because they didn't think to go at your pace and the other team took advantage to farm them for ammo.
I don't really see a PL cap needed, more than anything you just got a bad teammate which is really unfortunate, my condolences to your near flawless card and time.
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