Sounds about right.
kett73 wrote: Should I set my mouse over to my assist mapped key instead of assist slot?
Depends on the game. The default Assist Me mapped key will direct all your toons to assist you, and not just those in the Enchanter ATG. If you try to set that, it will tell you a long message about telling all your toons to tell all your other toons to assist them, so each toon will get multiple requests to assist the other toons, and it will all get a bit confused.
So, you will either need to Assist Slot 1 etc, as you have proposed, OR, create yourself a new Assist Mapped Key which has a target of Self, and then let a calling mapped key set the target of whom should be the assisted or assistee (which depends a bit on game and config as to how this would work).
Although, if you only want it for Slot 1, then set Assist Slot 1. If you want to be able to switch leaders and have it assist the other windows, then you might be looking at multiple clickbars, 1 for each toon, or a little bit more complicated by using virtual key maps/mapped keys to redirect the appropriate assist actions.