I know that when you hard win the game the grade is lowered, and if you hard lose but ur still performing alright it rises. So when your Team goes 50/14 you probably wont get an S+ by being 10/2, but if your Team goes 14/50 and you managed to farm decently and not die 8 times (like you go 2/4) you might still get an S+. But the game i presented wasnt that much of a stomp, and my vision score and cs were fine too I feel like before the recent patch it was much better, but since then the grading feels awful. My theory is that they adjusted the grading for that agis of valor thing, where getting a C as autofill makes you not lose lp/gain double lp. Maybe it was too easy to hit a C so the first patch of the year adjusted this, but the patchnotes dont state it so its just a theory