I am wondering about this "a lvl 55 mage with the pet focus aa". What aa are you talking about? Do you mean Advanced Pet Dicipline that is available at lvl 67?
To delete an item everytime it appears on your cursor use:
/cursor 0
To keep a certain amount of an item, like say a stack of 20 use:
/cursor 20
Also note that the inventory window has to be closed for cursor to function.
A bard with AA runs at 270 and the group members run at 256, you gotta figure out what multiplier to use based on run AA. At leas this is what shows up in my ui.