Ranked Matchmaking needs a HUGE rework

I keep getting A+ to S+ in every single game I play...even in the losses, so how the hell am I supposed to get out of bronze if even though I do more than is expected of me and manage to do better than my entire team and we lose, how am I supposed to advance? As far as Riot is concerned, a loss is a loss and it matters ZERO how and what you actually contribute in the match. There should be a LOT more factors in determining how much LP you lose (or even win) when the game is over.