Balance in terms of blizzard

I got matched with 6 players that went solo Q against 6 stack with the same SR !
That’s called Blizzard balance . Before that i had a 4300 average SR game and the system didn’t match solo quers with higher SR to balance 6stack .
As i see system works this way :
If you are in duo and meeting no stacks in team your average SR is lower
When you are in trio it’s even lower than in duo
Etc
But it clearly doesnt work against 6 stackers!

Ey, conjecture