I do the stance dance all the time... If I can get the extra hit in there its gonna happen and thats the ways it is... However you need to play the people your playing with if the tank is not avoiding the damage then you need to stop dpsing and concentrate on healing the tank... You can bring it up to their attention but that usually leads to bitterness and a bad run... I use alot of duty finder because im still low level progressing through the story and most of my FC is end game... Personally as long as the tank is pulling hate then I just do what i can depending on there play style...