Stonewall should require 6 end, not str since its an end based perk. It's about your ability to endure attacks without faltering.
Educated should be a lvl 3 perk so that it's worth taking.
Perks that affect hth such as Silent Death and Slayer should require either unarmed or melee skill, not just unarmed. Putting points into both skills just to get a perk is a total waste since they are redundant.