TG use TG ratings. 1v1 ratings arent meant to balance TGs. So mentioning the 1v1 ratings doesnt really matter. There is one benefit: I was able to track down the game. It really seems like a horrible match up.
There average TG rating was about 2800, while your maximum team rating was about 1900… Their average TG rating was almost double of yours.
Seems like you arent fully knowing the feature. The 7 min. rule already works if one team is in the queue for 7 minutes. So your enemies probably had to wait for 7 minutes and then got matched against you. There was nothing better for them available at that moment. So they got matched against you.
I am not sure if i understand what you meant. It is not like 15 elo for each game. Elo doesnt really work like that. You might even havent lost almost no elo after this game.
But i have to admit: The current calculations are flawed. They give undesirable outcomes. They also promote smurfing. There are multiple solution posted on this forum already. Have a look at Analyses of the ratings - Spotting the issues for example.
The ratings are bugged since release and it looks like the devs dont really care at all. As result you see threads like these a lot.