1 interrupt will make life very difficult here on the first boss. If you are running 4 shamans and a tank the instance isn't too bad since you get 4 interrupts. Any other combo makes it a little tougher.

The key to the fight is interrupting at the right time so he doesn't heal too much. Don't forget that after the asphyxiation he brings you to 1 HP so have a way to quickly heal yourself so you can interrupt him ASAP. Again, healing totems do wonders here so if you have those you're all set.

Your dps is fine. I was somewhere around 6k to 7k during fights and had nothing but blues on initially for the first clear. You should be able to do it np.

Be ready with the second interrupt. A lot of times he will siphon life that you should interrupt, then immediately mend himself. That is the one to make sure you get or the fight lasts too long and you go oom.

I posted a vid yesterday of when I was in blues doing it. Seeing it might help some.

Good luck.

http://www.youtube.com/watch?v=tm02_UES4o4