Okay, so, here are the rules.
If your team has less than 6 players for:
Less than thirty seconds: nothing
30-120 seconds: 25% SR change (25 more on a win, 25 less on a lose)
More than 120: 50% SR change (50% more on win, 50% less on a lose)
Backfillers cannot join cames that have:
(KOTH)
More than 30% before the opposing team can win the second map
(2CP/Hybrid1)
Attack: Less than 2:30 on the timer
Defend: More than 66% on the capture
(Payload/Hybrid2)
Attack: Less than 2:30 on the timer
Defend: Payload is more than halfway to the final point
If a player backfills, the same rules apply and it just stops the counter from going. Backfilling players get 50% SR change automatically
I feel like this would be atleast a little better. Backfilling would be rough, but, if you do it and win its super rewarding, and it should make the team with a leaver feel a little better.