How to fix Ranked for Solo Queue

Winning the game matters...a lot, but it shouldn't be the only way to climb. How well you play the game should matter, and now that we have a grading system (which is not perfect) why not use it assigning ranked points? If you win a game and are carried, you still gain points but those base 20 points are modified. If you get a 'D' then maybe you only earn 18 points for that win, and if you earned an 'S' you get 22. Likewise, if you lose, the points loss can be modified by the grade. So playing well in a defeat matters and NOT SURRENDERING matters to the number of points lost. This will help players rise and fall based on their merits and not who Riot randomly assigns to their team. If you're playing with buddies, great, but if you're going in solo and pulling your hair out when you get a team of 5th graders then you can play for your grade even if the win is impossible and save yourself a few points. So we can have a Solo rising mechanism without creating a separate Solo Queue. Whether you get points or lose points is still determined by who wins or loses the game, but caliber of play modifies those points. I think that's fair and better than what we have now. What say you Summoners?