Macro - Animation lag?

Ok so I pretty much have most of the macro's down but I got a strange question.

I am using a focus/assist macro on my slaves and the normal spells on my main (I'd like to change this if possible in case he dies and I have to Pip switch but I'm not sure what to put in his spell bars for macro's yet). Anyways when I have my chars on follow and I stop and start casting Lightning bolt only my main starts casting if the slaves are still moving while on follow. I know you just spam the macro to get them to cast to when they stop moving. Anyways there is a few times where I look on their screens even after doing this and I don't see them casting at all? Or when I am switching targets fast and start spam casting they don't see to cast for a good 1-2 seconds it seems.

I read something about target of target and focus target having issues (game related) could this be the reason and I really just have to deal with it?

Also when I am using the follow macro and say I cast a spell on my main and cancel it (by moving) but my slaves continue to cast, but if I continue to move (I'm guessing far enough away for the slave to keep his follow) he stops casting too? There is no way around this? Or would the work around just break the /follow macro?

There is always gonna be a lil lag between you cast and yer other chars no way around that.

One of the things yeh can is make targeting a separate key that way the pause between you hitting the yer targeting to actually spell casting yer other chars will have gotten there target.

What I also do is have the space bar to make em move some direction that breaks follow and stops casting.