27.0 Kda 525 gold per min 71% kill participation no S- :^ )
I just cant I just cant understand why i didnt get S-

I just cant I just cant understand why i didnt get S-

119 (2.8) CS
over 42minutes. thats awful. (i cant see which game in particular you're talking about, but i dove into a 3rd party sight and im assuming this is your best game)
your average cs with Kled top is - 64.6 over a full length game.
cs is a huge factor in determining gradings. whether you won the game by a huge lead or not and ensured the enemy team had even less than you did. its the self limiting flaw of mastery.
I have no idea how this works either. Maybe it's the role of the champ with the score or something. I've gotten something like 1/3/32 as a support Kayle before, and only got a B.
I've also noticed how the enemy performed seems to have an impact too. I went 11/0 on a top Nasus, but the overall score was like, 30/10. I only got an S- in that game, but I got an S in a game where I went 6/0 but it was more even.
There's just something odd about the calculations that we probably don't know about, which imo is a good thing otherwise some people who are after the tokens would behave in such a way as to get them rather than focus on winning the game (e.g. if it's about K/D/A, they'll be kill hunting to the point it may cost the game).
The system is pretty easy to exploit, if you have high cs, and a decent kda you're almost guaranteed an s rank, even if you lose (you still get very little champion xp if you lose, even if you got an s rank)
My Cs is made up of Fodder made from Champions :c [zombie-nunu-bummed]
I think you may have to place more wards as there is such thing as a vision score.