Rework LP gain/loss ?

I think that riot should tweak the mmr gained/lost per ranked match based on how well a player does in that game, vs on their mmr. Personally I have played countless games where I do well as an individual but ultimately lose the game, and from that loss I would lose 20+ LP, even though I would do relatively well in that match. So in my opinion, it would be better that if a player does well in a game shown by C, B, A, S, etc, could either reward a player more LP when winning and playing well, reward a player less LP if they played poorly and still won, take away less LP if they played lost but played well, or take away more LP if they played played poorly and lost. I believe a system like this would help lower elo substantially and other gray areas where skill level is unbalanced.