Replace "BLIND" in Head Shot with "KILL". If you want it to be competitive and have something other ranger trees do not.
Alternatively replace "BLIND" with some affect that works on bosses... 10% vulnerability? That would be PRE defining as well.
Also for being a "stalker". One who "stalks" which suggests movement around the prey... this PRE does best when standing still.
Deepwood Stander? Hmmm... what if they could maintain archer's focus while sneaking?