As a 37th level Empathy Defender I haven't taken Adrenalin Boost yet and probably won't because the drawbacks seem to outweigh the benefits.
It would be great to know the intended use for this power. Is the idea for Adrenalin Boost to offset drawbacks to other top end powers like Nova, MoG, etc? If so, while this might work great in a duo, it doesn't seem like a good power for people who typically group with three or more people.
Suggestion:
How about turning Adrenalin Boost into an area of effect power? Turn it into a combination of Recovery Aura, Regeneration Aura and Clear Mind with a similar but more severe effect as Absorb Pain (it reduces the Empath to 25% health and renders him or her unhealable for 30 seconds)
(edit: clarity)
