Is achieving an S with Jhin broken??

So it seems that no matter how hard i try, how well i do in a game i cant EVER get an S of any kind with Jhin. Is this a bug or is it just the game? i just played a game and went 22/7/17 with 246 cs and got a A+. i legit don't get how that could be possible. To me that seems like S material but i might be wrong. Please help
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