Well, the switch from HALO to CASCADE made a great difference, so did the switch to ToF. I was able to down the 4 waves esily, and as for the fifth, we aren't even trying... Sad part is we still can't get through Elegon, I think it's a dps problem: with my 474 ilvl I'm doing around 98k-108k dps on average, I'm top dps in my raid, with the lesser dps beign around 58k. With 6 dps, I would estimate the requirement to be above 75K on average, or maybe more?
We get to the last phase 3 times out of 4, but we can't even go under 15% on the boss.