BS Ratings From games

So... I just played a game as Zed and went 15/0/15 with like 180 CS. After the game was over I was expecting to get at least an S-. However I received an A+. I was extremely mad because my teams Illaoi went 12/7/8 and got an S-. This makes absolutely no sense. I have gone 10/0/1 as Zed and gotten S- before. Someone plz help because if this isn't an S tier game then I don't know how I can get mastery 7 ever.
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