Question about placements

Ok so i have had this the previous season as well were i would get several wins (always more than loses) and i would gain like only 60 sr were the season before the previous one i got the same wins and close to 200 sr.

Season 15 i got 6 wins and 200 sr with the season high of close to 2237
Season 16 i got 7 wins and 60 sr with the placement of 2297 and the high of 2347
And season 17 i got 1 draw, 6 wins and 3 loses and aparently fell down from 2347 to 2314

These 3 seasons i did the 1tricking thing with lucio and got prety decent at playing him and learn a lot of combos for bursting down squishes. A lot of reddit lucio plays, hours upon hours of contesting and more. However, in season 16 and 17, I did the placements with a fried who is ranked bronze fondling around 1400

And i am thinking if this is the reason i get so little sr.

Now i am thinking about doing the placements on my ult without him and see what happens. If there is anybody who knows more about how the ranking system works pls i beg you let me know!

Thank you for your time!

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