in the game i have lost so much SR when i first ranked i was gold, After that in the next session i was pulled down to bronze by throwers smurfs and so on.
From then on i have not been able to climb back up, I think it would be better to judge SR on a players own skill to climb not a win or loss of the match.
If you win then yes you get more for you contribution then you would if you lose but latest you would have a chance to climb over the others that just hold you back and go out of there way to throw the game and leave for no reason.
My friends all play in the high gold to plat so it,s not possible for me to work with them.