It helps to always maintain the correct camera angle on everyone. I do the camera adjustment every 1 or 2 seconds off of my DPS rotation macros. This keeps the views square with what I'm doing all the time. Regardless of what I'm doing.

Then it's just a matter of a repeat action in a window of about .5 to 1 seconds. So long as your toons are in proximity and their cameras are aligned the AoEs should drop relatively close together.