Weird LP gains when u hit diamond

So my Eune Main account got f.. MMR so i started smurfing on EUW and went from bronze 3 to diamond 4 with 60% win ratio and no lose streaks in couple of weeks. Tell me this why am i getting only 14 LP and Losing 20 LP its impossible to climb higher i dont mind having bad games or trolls but this really destroys my game So im asking why am i getting so low LP when my MMR is fine Idk if there is a lot of 60% win ratio dia 4 players.
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