Soloq rating

Can someone explain me how this ****ing rating works.

90% of the time when I win I win 7-8 rating and 90 % of the time when I lose I lose 15-17.
I'm so pissed now ...
If I lose one game I have to win 3 more to get my rating back what the ****.

You want people to farm more on this server ? Then change that cause most of the time I log I win one game then I lose 15 rating and I don't play for 3 days

among other players i also dont understand whats up with that since the recent changes, regardless of the queue time or match mmr it is just always +6/-14