The damage per trigger pull is high enough that they aren't needed. Hidden Hand rules out a good reload perk(Outlaw, Feeding Frenzy) for more forgiving aim where Hopscotch has a pretty slow reload speed. Headseeker isn't needed if your gun has high enough stability(Braced Frame, Hand-laid Stock) that all your shots are landing on the head anyway. While you can get those perks, I was trying for max stability with good reload, which I got.