I had strength and speed at Mythic, with a possible Physical Immunity with the Catch of, "literally ripped to shreds and burned", which isn't a Catch at all. They're doing at least eighty mph on foot and can basically just slap a speeding car to a dead halt. One handed. Feeding Dependency is appropriate, but the detriment is basically absent. You kind of just get a little less sane and more "evil" if you don't feed, and even the evil thing is debatable. I'd give them Venomous Claws and from what I recall, enough of them (more than fifty percent) have the psionics, so i'd make it a Must of the template, or at least an Option. Like how "At Range" is an "Option" for WCVs.
also, extra appendages derp kerwoo wha? They're bilaterally symmetrical.