Most times when i pull hate on a decent tank, its cuz i started to do damage on mobs before he finishes gathering them, but just run the mob to tank so it gets hit by his abilities and they tend to grab it off me. Namely happens on PLDs that decide to "save" the circle of scorn (which on most pulls you really dont need too you will have it off cd by the time you finish the gathering) Do keep in mind that alot of tanks will just ignore one mob on you specially if you start to kite it away from them, and if its on low HP. (when I pull a mob like this i just switch to it and blow the gcd needed to finish it)