Faceit matchup system broken?

Hi there, I'm at 3.3k elo and I mostly play solo, but 80% of the time I keep getting matched up against 5 stack, meanwhile my team consists of only randoms, and the thing is that I lose full elo (25 most of the time, sometimes even 27) and also I keep getting teams from Esea. I don't have premium, I don't intend to buy it, but please let us have fun, I wanna get matched up against randoms or even duos/trios and not a full team, it's really boring. I guess it's mandatory to buy premium, no? So you can get only up to "trios" against you...