Well, no idea if this will help, but this is the macro I put on my resto shaman for instance running:

Code:
/castsequence [target=focus] Earth Shield, Riptide,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Riptide, Chain Heal,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Riptide,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
It goes on my spam button, so yes, it goes off even when I don't need a heal, but in an instance that isn't often. I also have a

Code:
/castsequence [target=focus] Chain Heal, Healing Wave
set up on a seperate button for when I need a stronger heal to go off. Adjust the commas to 12 time the number of times per second you hit the button.