The macro needs to be as follows:

/ac “Misery’s End” <t>
/wait 2.6
/ac “Heavy Shot” <t>


You need the quotes so the /ac commands knows to use the whole thing instead of just the first word Misery's, and you do a 2.6 wait because I've noticed a 2.5 wait sometimes depending on server lag doesn't work to let the next attack work