I am having a hard time answering this myself from the sticky info.

I dual-box (play two characters only)

I use a macro like this on the slave:

/cast [@focustarget] [] Damage spell

--or--

/castsequence [@focustarget] [] reset=target Ability, Ability, Ability

That all works great while both chars are alive but if I have to switch to the slave nothing works

What would be a better setup?