How to get an S????
I have been playing a lot of Vayne recently, trying to achieve level 7 champion mastery with her. I have been consistently playing well with her for about a week, I am currently in Silver 1, in promos for gold. My KDA as Vayne for the last week has been scores like: 14/2/7, 17/10/17, 12/1/8, 7/3/8, 17/10/19, 13/3/7, 17/4/8. Throughout all these games I have maintained high damage dealt to champs (usually in top 3) and high cs. however, i have earned about 20 S minuses and no S's. Is there something wrong with the system or does riot expect me to have a perfect KDA with about 15 kills, highest cs, highest damage, and most towers taken to be able to earn an S? I have gotten S's playing way worse than I've been playing recently with Vayne and with MUCH easier champs. please tell me what it takes to earn an S. This has been happening for about a week and I'm beginning to suspect there is a bug where somehow the game can't give me an S.