I've done it 4 times and have yet to beat the raid. I've even done it with people under level 280 while being under 300 myself. Light has little to do with it, just make sure your tactics are on point. You either have to work as a team or be damn good player's individually. I have done it either with no teamwork, or relying only on teamwork. I was successful either way.
It just sounds like you need to coordinate a proper assault, while you currently just head in guns blazing. It might require a lot more thought than that. Seriously, min-max the he'll out of orb generation, any damage, crowd control, and the amount of time you stay alive. And focus fire on those flights and the boss! Don't worry about the psions unless you have to! A good warlock should easily take care of them!
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Ah no, the one with a 270 was done on the day it first came out. Definitely wasn't recent. And I did it twice that day, hoping to get that Damn Vienna Singer to drop but alas, I still don't have it. And yeah. I tried it a few more times. I think I beat it about twice more just to help people out (and possibly get the Vienna Singer), and possibly have attempted more times than that, I honestly forget. By the way, are you checking on a computer? Because I roll with the mobile version, and I didn't know that one could check a specific mission to look at much less who they did it with and what light level they are/were.