This mmr system is messed up
I worked myself up from s5 to s4, won many games in a row have 75% win rate in last 20 games and still I only got 13 lp for a win just now.... Why does it still give me so little even if I have proven my mettle? Imo there should be no mmr at all just an elo and you gain elo depending on how strong your opponents were, thats how it is in chess and I can't see any logic behind the elo system in LoL. Simply makes no sense to rate you based on speculation rather than performance.