Impossible to Climb. (LP Gains so harsh)

Every win I get, I receive 1 less LP. Every loss I get I lose 1 more LP. I go on a 10 win streak and get less and less LP for every match. It doesn't make sense. 12 LP for a win 20 LP for a loss. Going on a big streak doesn't raise my MMR. Losing a few games absolutely TANKS it. I have a 70% win rate in my past 20 games (Overall 55% this season) but I can't climb. The more I climb the low ranked players in grouped with. It makes no sense. My MMR if anything is decreasing the better I'm doing. Is the system harder this season or what?
Report as:
Offensive Spam Harassment Incorrect Board