I agree with the above post that the backing vocals are competing with the lead. They just need their own space. You might even want to dirty up the lead screams more, so that they stand apart from the sung backups.
I just realized the all-wearing-one-color performance in the video really reminds me of the Refused New Noise video:
http://www.youtube.com/watch?v=K8MkVIe9xGc
The album that is from, prophetically titled The Shape of Punk to Come, was groundbreaking. Released in 1998 and inspired a whole new crop of screamers: http://en.wikipedia.org/wiki/The_Shape_of_Punk_to_Come