I do the 2x healer pvp set bonus that decreases the lockout on shield, plus 2x campaign armorings that give a -1.5s decrease on healing trance.

I have also replaced the +expertise in both my main and off hand weapons (with +41 power crystals).

I don't feel squishy at all. I took over 500k damage in a WZ a few days ago, still dropped almost 700k healing and only died twice (thanks to spot heals from my sawbones scoundrel healer buddy).

Most WZ's I don't require much healing from friends, will see about 200-300k dmg taken, and can heal between 500k-700k with usually only 1-2 deaths.