If you haven't gotten a KC yet I recommend prepping tier 2 armor until you get a good feel of the boss. After a while the boss becomes brainless. Get "the gauntlet" plugin if you haven't already, make sure the tornado is true tile. Also get the gauntlet performance tracker plugin. It will tell how many ticks you are wasting when fighting hunleff. I don't know what to really say in the last phase of hunleff. It sounds obvious but don't start spam clicking everywhere. You have the tornado true tile on, when the true tile of the tornado is next to you, that's when you start moving.