If you queue with a player in a lower SR, do you lose more SR points if you lose?
If you queue with a player in a lower SR, do you lose more SR points if you lose? and gain less SR points if you win? due to the fact that you are playing in a lower rank.
Solution 1:
No.
Unless you're part of the Brazizlian 6 stack the game will be able to find a suitable match with a similar SR to your party sooner rather than later.
As far as the game is concerned you're all evenly matched and the SR you win/loose will be the same regardless of weather you're 500 SR above your friend, 500 bellow, or solo-queuing.