Issues with my 2 slaves assisting while I'm a tank

I'm very new to this and have spent quite a bit of time trying to find the answers myself with no luck. I'm running 1 Guardian Druid as the master and 2 Balance Druids and my slaves. I can't seem to figure out how to get the 2 boomkins to assist me while I'm attacking on the tank. If I swap to one of the boomkins, both the tank and other boomkin assist me fine. I'm sure this is any easy fix but I'm stumped. Any help would be appreciated!

Here's my config

http://www.privatepaste.com/5ce9e79af8

[lax]

Other than your tinkering with other Key Maps, your config looks pretty much default from the Quick Setup Wizard as far as assisting goes.

So I'm going to guess one of two things which are not in your ISBoxer config

1. FAQ: I recently set a key binding in the game and now assist doesn't work?

2. If two of your characters are in the wrong windows (this should pop up a message when you log into the game, which you have to click away, informing you that it expected a different character), then follow and assist will target the wrong character

Thank you very much. This fixed the problem.