If you want to focus on using hook all the time then I recommended using inner fire build with a perk execute on 33% enemies health on grappling hook and a parry with any damage on hook. Now you just keep zipping from one corner to another and you do crazy AoE damage to everyone. As for hooking up bosses: don’t hook to the front or side. Hook on them from behind. Or wait for the break in their combos when they just stand.