Grading System

The grading system is highly flawed and I've been told to turn to the Discussion Forums to vent. I've been trying to earn S grades to level up and earn the Level 6/7 badges; however, I've noticed a huge flaw in the metrics used to grade us. I've played several games and have used trial and error to find a way to earn these grades with some sort of guidelines, since Riot refuses to give us any (which is unprofessional and quite ignorant in my opinion). The flaw is as follows: If I play a perfect game, I should earn an S+, no matter what. It should be a simple concept, and I don't understand why they are so afraid of people "abusing" the system, when in reality, It's people learning and playing the game based on your set guidelines. They refuse to tell us how to earn these grades, and when we do play well, we are poorly graded. I have had several instances where I have played flawless games and proof to showcase these instances where I have gone 11-0-10 as a Sona, 17-7-11, as Lucian, and so on and so forth, and have been undergraded. I do not think it's fair to grade people based on the performances of other players. That's highly ignorant and toxic. Also, the guidelines towards getting these grades should be fully disclosed and open to the public. It's only fair to those striving to earn these grades. It's highly irresponsible to openly say to the public "Yeah, there's a method to getting these grades, but we won't tell you because we don't want you to earn them." It honestly doesn't make any sense and I hope to A.) see a change in these rules B.) see a Change in how Riot is ran/ operated C.) that all the rules and regulations are fully disclosed to the public and not hidden from us. Only because I know for a fact that a few higher tiered players, know how to earn these grades. It's not fair that they get to set the "Standard". We should all be graded on our individual performance, not compared to Master summoners/ Challenger tier'd summoners. Make the playing field level. All for fairness. Not whatever this is.