I bounced my dance-partner-buff on and off every single dps during Sophia NM today, to finally land it on my pocket-healer.
Why? Because all of them were playing pretty badly and my healer-boyfriend probably dealt more damage than the samurai, blackmage or bard.

I'll put my dance partner on a dps at first - always. But if I observe them being bad, they lose that privilge and I'll pass my buff(s) on to the healer or tank. I admit to hoping that they'll notice and think to themself "...wow... the dancer just stopped buffing me... I must have done something bad..." - but I know thats wishful thinking...