Ranked system still needs a lot of work.

I have been playing since came out and have improved a lot as time went by. Going from the Bronze to Silver was a huge achievement for me and it was made possible with the new ranking system using league points. However, now i feel like it is working against me. Placed in Silver 4 at the start of Season 4 i worked my way up to Silver 1 and faced some great opponents. I felt challenged and even after a series of a few losses being demoted back into Silver 2, i felt thats where i belonged. Recently over the past 8 weeks or so i have progressively lost more points than gained and just dropped back into Silver 3. Why if my opponents have a "higher mmr" than me and i lose, i lose 20+ points? Yet if i win, i only gain 15-17. To me if i beat tougher opponents i should get more, right? I know i'm not good enough, yet, to be placed in Gold but where i'm at currently is making my League experience in the 4 years i've played awful in ranked games. I strongly think the league point gain/losses needs to be looked at again.