Thanks for the tips ... tried the strategy of pulling to another room so I could have more space to move forward. It does not work. As you can see by the video below, it is not possible to continually move out of the puddles - the puddles are dropped way too often.
Not sure what video you were watching ... unless I just haven't trained healing stream and nature resist totems on my MAGES. I don't have shamans. I also am not using shamans on my team. To further add to the difficulties I'm facing, there are currently no shamans in my comp.
Attempt # 2:
http://www.youtube.com/watch?v=TNdzwq6ZgJ8
Going to try jimbob's idea and figure out a way to heal through it while trying to manage the aggro better.