Re: The Hook Grip
I use the hook grip when grip/forearm tension could possibly throw off my form.
In O-lifting I really try to focus on pulling with my hips, arms like strings, and a hook grip lets me keep my arms loose.
On deadlifts I like the grip strengthening that occurs when you use a normal grip, likewise with pullups. The added strength/endurance training that my hands get is a big bonus, and there's no reason to try and mute forearm tension, so no hook grip.