Diamond LP is so unbalanced...

So I recently am getting boosted/super low elo players in my diamond games. No idea as to why but its forcing me into losses there is nothing I can do about. I am getting 10 LP per win in diamond 4. 10! I was in promos for diamond 3 and I won one game lost 2. putting me down to 70 LP. That means Im losing twice the amount of LP as I am gaining which is completely ridiculous and unbalanced. You have to win 2/3 games to just stay even in lp WHAT?!?!? Super confused as to why this is happening to me and I hope other high elo players can explain why. No low elo players please you don't understand sorry