What is wrong with my MMR?

I've been dominating solo queue for my past 100 games now and yet my MMR is still subpar for some reason. It shows both in my lp gain and in general im still getting matched up with people below my division. In fact i felt i should've skipped division a few times now or gotten 30lp gains at least. I've actually been getting less lp per win than losses. ( right now im only gaining 16-18 per win )

My win rate is overall 57% and close to 70% my past 100 games. here is my op.gg for reference http://na.op.gg/summoner/userName=macro+hard

Not sure if mmr is bugged or what but im very confused. Idk what more i can do to raise my mmr. I've already 2-0ed my last 3 promotions. any ideas?