There's not much AoE benefit for being in Recklessness except for a few key gambits:
War Cry: Can start a second DoT on crit. Up to 10 targets, 25m range
Too high for you, but makes recklessness worth it:
Resounding Challenge: Acts as an AoE damage in recklessness, up to 10 targets, 25m range
Call to Battle: Acts as an AoE DoT in recklessness. Up to 10 targets, 25m range
Other than those 3 gambits, Recklessness AoE is pretty much like Determination AoE with less survivability and faster power drain.
At level 40, you only have access to War Cry and Fierce Resolve. My advice would be to set up Fierce Resolve and War Cry for the DoTs/leeches, then proc potency with Goad and put a medium bleed on 2 mobs with Mighty Blow (you'll need to be in recklessness for that), then proc potency with Defensive or Deft Strike and put a T2 DoT on 2 different mobs with Brink of Victory. Repeat until no mobs left. When you get to level 50, replace Mighty Blow with Unerring Strike.
That should be the most efficient use of all your bleeds and Dots for that level.
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