Hyperfocus makes Focus Cocktails restore more Focus right away and keep working longer. It is a Tier 2 Ranged skill that only pays off if you craft and drink Focus Cocktails.
It is a niche pick. Take it if you plan to use Focus Cocktails in Horde fights, otherwise use it as tier filler.
Focused Shot, Crowd Control and Green Thumb.
Drink a Focus Cocktail right before a big push. You get more slow-motion time when it counts.