Something I haven't noticed being mentioned much is group positioning...
I leave my group down before the garden's first door, or maybe up the ramp before the second puma spawn. Before I make the pull, or attempt it, I take a mob to the group and then run to the T intersection. Cast my zomm helm, get the eye in there, doors open, Furious targeted, and then the rest of the process.
Shield of Notes is a good idea, I just never really see the need for it, I don't take much damage when doing this. Generally 80% or so, depending on caster's and my luck. Lowest I got before dying was 4%, which was scary cause I kept getting nuked for 2-3k, and Veeshan with VOTS on didn't help me.
Also, I always let my group know what I'm going to do so they know to stay back, and if I get low on health or whatever that I might die, etc. Generally they don't mind since clearing the mobs before him would take longer then me taking 2-3 tries on it.