Demotion Rant

I don't understand the demotion system. I get demoted after one game at 0 lp, after getting consecutive S's in a losing effort due to an overzealous Hecarim. I usually get S's or A's, and I still only get 13 or 14 lp and I get -26 when I drop a game no matter my score. A Yi in my earlier game went 1/12/7 and got 29 lp when I got 13, and it just feelsbadman. Riot needs to fix how mmr is tracked, silver just feels like a crapshoot for this sole reason. Too many variables to realistically climb with, and the odds/clamps get stacked against you right after you get three games with an MF support that swears they "Can carry this game". End rant