BLM Macro set-up

[ChameleonMS]

Neither of these is 100% to guarantee for targeting the tank but they are reasonably reliable.

<tt> - target's target, as the tank should have all the enmity, your target's target should be the tank.
<2> - player 2 in the team list, as usually are 1, and then is goes Tank, Healer, DPS
e.g. Macro usage
/ac "action" <tt>

For you cooldown reminders, you might want to experiment with /echo
E.g.
/ac 'Buff' <wait.60>
/echo "Buff is ready for use"

What this does, you execute the buff, then a wait counter occurs in the background, set the wait equal to the buff cool down.
Then it displays a message in the chat that only you can see saying the buff is ready again.

Another thing you can do is use no waits, and just button spam.
e.g.
/ac "Raging Strikes"
/ac "Quelling Strikes"

Button press one will activate first available buff for sure, and might but not usually the second. Button press two will definitely get the second one. Even commands off GCD do have a partial second delay before you can activate then next one, which is about the length of time needed press the button a second time.