When will LP normalise ? (+14 LP per win, sometimes even less)

Idk if it's MMR or something but I have 52% winrate and gain +14 LP per win and it's rly killing my desire to play ranked. So if I want to go up a division I have to win 7-8 games in a row + 2 promo ones ? Can anyone tell me wtf is up with that ? Link or a summary is greatly appreciated.
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