With alot of back and forth on this i feel i have it perfect. i use it in bg and for grinding. and i see no reason for it not to work in party just as well.
*changed the bubble to a cast when available buff*
set your timer to 10 secs that way they wont build up on you
if you dont have any it will ignore it
also, try pushing the button manually and be sure it works
did you set up the timer for it? also be sure to check all of the settings in the macro setup, the timer and a couple of the othjers will make a difference