I have made a macro wich helped me a lot with Aetherial Manipulation (playing on controller).

/macroicon "Aetherial Manipulation"
/ac "Aetherial Manipulation" <t>
/ac "Aetherial Manipulation" <2>

You can either select a target, or when no target is selected (when you have the boss targeted) this auto-targets the tank (with the standard group sorting).

I have read somewhere you should target someone who stays safe and they recommended the healer... but I have noticed healers usually don't stay safe. Especially not when you press the button early. Also you can't always use the same macro because the position of the healer in the group list is different in 4 and 8 man partys.
However, the tank is always on number 2, so this macro works in 4 man and 8 man content with no difference and because tanks are meeles they usually stay already safe when you have to move.
The main problem is that you get cleaved when you are porting to the tank. But that's usually not true. You use Aetherial Manipulation to dodge mechanics, and when the boss is casting mechanics, he is not cleaving the tank.

Giant AoEs with the safe zone at the boss, damage split markers, knockbacks, boss turns around and cleaves through the arena... just teleport to the tank and you are fine ^^