[High win rate][Hugely lower team]

I wanted to pass Plat in a week I was GOLD IV, at first it went very smoothly like GOLD IV to GOLD I with something like 30 win for 6 or 7 loses, and then first time I reach GOLD 1 BO5 I lose 3 games in a row ( it had never happened ), I was still carrying in my lane ( One_trick KLED top tier lately ), and I lose games with S marks, in that BO, I lost 2 games scoring a S, so I believed it was bad luck, I went back to 40 LP.

Then I win all my games back to the BO5, and then again I carry my games and still lose all 3 games, reason is in every of those 6 games all the other lanes, jungle, mid, bot lost and fed hard, all 6 games, so at this point I'm thinking it's really bad luck, I play again to a 3rd BO, and then again 3 lost 1 win, I was 12/0 the win I made and the other lanes still lost, I had about 75 % win rate when I first reached the BO5, so I found it super weird to have such weak m8 all the time, I took my excel and began to compare the teams, in BO5 my mmr must be super high but there is a limit to unfairness.

On average by comparison me not included my team's winrate was 9~14% lesser that the ennemy team's one, I basically was playing with the worse of the worse every time people with negativ win rate in Plat IV or more, againsn't people on win streaks with higher win rates, every game, I think that's how the algorithm is made and it is really unfair because those people are uncarryable these games are just a loss of time, as they don't have the level and always lose to those high winning rate opponents, and 10 times in a row in BO, it is just comforting the fact that the game is artificialy lowering my MMR by giving me the worse mates ... and making me lose my time there should be limits to that balancing methods, the better you are the worse is your team because the algoristhm is just doing some sort of sum since it has to respect the ranks,(Plat IV ) it's taking the worse Plat IV to match my high win rate ... I lost hours of gaming for nothing.

If someone encountered something similar smurfing or equal tell me ? and let's ask RITO to limit this balancing process that creates teams of weak players around one high rate winner.