Mastery ranking is busted

so im trying to get mastery 7 master yi, im a decent yi to say the least, but i then go 12/1/16 with second damage in the game, second farm in the whole game, 35 ward score, solo killed 4 drags rfit and baron, AND IT COUNTS AS A FLAT A wtf is that, that scoreline with any other jungler is an s+ easy they need to stop with this the better you and other do the harder it is, mastery means nothing so why hold us back on getting it, i was literally robbed from my mastery 7, so what am i to do feed my ass off till my stats go down so i can get an S which ill get banned for, or pray i get the perfect storm and get 30 kills, it just stuns me when i think about how much riot really dosnt care, there should be a point where if you go a certain KDA it just counts as a insta S, i mean 12/1/16....................any other jungler is getting atleast an S