help me understand why I didn't get a better grade
I have over 100k mastery points on Jhin. The highest I have ever gotten on him is an A+. I know to get an S you need to have good cs, presence in securing objectives, etc etc. This last game I went 16/3/17, helped take down two barons and multiple dragons, definitely helped take down turrets, my farm is the highest on my team and almost higher than anyone on the enemy team. However, my performance overall is apparently only worth a B+. I really don't get why I didn't deserve a better grade, and need a more knowledgeable player to help me understand. (Feel free to look up my summoner's name or whatever to get a better idea of what I'm describing.) Thanks in advance