Is there a "losers queue" for comp?

No, there is no losers queue. Not everyone is consistent and there could be other factors causing DPS to perform poorly. There needs to be space for the team and also heals of course. Not every playstyle works out in random groups. It’s much more consistent if you play the game with 5 stacks with the same people. It’s a huge advantage. Comms can also make a world of a difference. A friend of mine is really good at comms, so I always say comm diff when I duo with him, lol.