Whats with the league AI on getting S for mastery 7?
I've been playing vayne for the past weeks doing really good (in my opinion), with Vayne getting kda like 19/4/8 and gaining 3 turrets and 1 inhib as well as literally 1v5 their whole team I even ended the game gaining most gold throughout the entire game ending with 259 cs. Yet I still don't even get an S or S+. I've been getting scored like these and better for the longest time yet it only gives me -S or lower despite everything I do. Not only that, but the only time i got an S after i reached master rank 6 was when i went 6/4/2 with little cs, turrets, or warding. What do you guys think about it?