Too little RR gain

So, for the last 20 games, ever since new act, ive been getting really low rr gain. I thought it was because of my mmr being too low, ive been getting queued with lower ranks, but thats the opposite. The lobby is around 6 gold players and 4 plat players. I do very very good and have good usage util, and even when I match mvp I get so little RR