Well, how much Perception do you think is required for keeping Ranger at a good distance? The con isn't for Vitality it's for taking full advantage of Glass Cannon (because CON adds to the Maximum AP. THere's no point in getting 14 AP per turn if your max AP is only 12 with low CON).
I mainly rely on just normal Ranged attack for my Ranger, other than of course special arrows and the occasional Charm or Ricochet.
