why does lp gain decrease if youre at a 55% winrate....

so i got promoted to d5. won a game. 20 lp. then 20 again. then 19. lost 2 games and won 2 afterwards. next game i got 18. i kept climbing. to around 80 lp. i then won only 16. i mean my winrate was positive i got into promos in like 15 games and my lp gain just keeps decreasing. if i want to actually climb i need to be at like a 55% winrate to even gain any lp. whereas a bronze friend of me still wins 22 lp after 150 games at a 40% winrate. rito why are you doing this? dont want higher elo players to climb or what?
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