Cheers to you for attempting this at sub par gear. When I downed this instance on normal, I had none of T9 or any set gear for that matter and just sported some crappy rep gear. When I was at same level gear I found that my DK tank held up better than my pally for interrupts. Now it doesn't matter anymore even on heroics.
Anyway, here's what I do on both normal and heroics:
http://www.youtube.com/watch?v=nxmHq-0a9bE
Found it easier to do this as oppose to just following. I maintain just enough distance so DoS is between me and the shamans for when he starts beaming. soon as he beams, i press follow and just start running behind him and nuke while he continues to beam. At some point, you'll get the hang and most importantly the timing of when to stop nukes and run for beams.
EDIT: This was prior to ISBoxer which improved my game greatly as I don't have set buttons for specific targets (healing) anymore. I basically just do click-throughs. Additionally, my gear at the time the video was taken was already above the instance level - was just farming for some specific items I still needed on some toons.
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