Idk why I lose so much rr but barely gain.

I'm G3, P2 peak and I can't rank up without extreme effort. Ik I had a bad loss but -27 rr is wild but even on mid losses I still lose 23+, yet for a win I get anywhere from 16-22 with an exception of 25 for a good match MVP. Why is this happening and how do i fix it? I was thinking maybe it's a tracker score thing but my score is a 891.