"Better" fix for flex? Nah man

I am just here to rant and blow off some steam. Last week I did my 10 placement games and won 6 out of 10 and got placed in B3. I grinded the entire weekend and got to Silver 3 with a 70%+ win rate. Now Riot implemented a better system and we had to do one placement game, in which I did so. I won that placement, still have a 70%+ win rate and I get placed in bronze 2...... So yeah I am a bit frustrated.