How to make slaves top follow when main is casting

I dual box (1 PC) 2 resto druid in WoW with Isoboxer (using auto-wizard)
I'm using repeater region for click casting using Grid. My slave healer is simply casting the same spells (cloning my actions)

One problem I'm having right now is that when I'm moving my master (while my slave follows) and cast a non instant spell like nourish, regrowth etc.. my slave doesn't immediately stop following to cast it too. In other words, I'd like to make my slave stop following when the master is casting certain spells like nourish, regrowth or healing touch because if the slave is "following" my master when he casts, then the slave doesn't cast

Use a movement key such as strafe or the arrow keys to break follow.

?? strafe, my toons all move with me. Depends. How much movement is OP talking about?

If its a lot, then create an ATG and use your non healer as a melee, and add an IWT action to the start of dpecific DPS keys. Then play the healer as the main. Problem solved.

i have mine setup to walk back using the ` key, left of the number 1. and shift+` makes them move forward, directional keys make them move left right forward and back also. but the ` key makes it where i dont have to reach very far to make them stop if i get death gripped or need to stop them on the fly. My tab key targets on the main and /follows on the slaves.

As a general rule of thumb you want to put the keys you will be using the most within easy reach. Which is probaly obvious but i've had to setup different people's macros, keybindings, etc that had their most used spells on #9 and down because that's the way they recieved them leveling up and they never changed it for some reason.

Maybe that's not default. I've passed q and e to my slaves for so long, I don't even remember anymore. Since my guys are melee, if my tank needs to strafe out of something, there's a pretty good chance my slaves are standing in it to.