You said before you have 2 BRD, now i also know that you have 1 MNK which means you have either atleast 1 caster or 1 DRG as fourth dps. If it's a caster my foes argument is valid, but you denied that so i'll just assume you have a DRG. Also you said before that one of the BRD supports the group. how? if you don't need foes and the MNK doesn't need tp song? But either way, a MNK who doesn't need tp song in t8 is definitly managing his tp so he won't need it, which results in less dps. Less dps - not as efficient.
And yes there are countless different strageties out there for t8. Still an efficient strategy isn't determined by my own opinion, it's determined by simple and plain maths! If you don't meet a dps check you try to push your dps harder, how can you achieve that? You either do it over and over aain until you can play it perfectly with your eyes closed and hope that this will give you enough dps to meet the requirement, or you try to figure out a more efficient Strategy. If you go with the second why not just go with the most efficient strategy dps-wise which leaves some room for mistakes? Ofc you need to adjust the Strategy to your group - example: If your healer needs ballad for whatever reason (be it gear, not knowing how to heal that turn perfectly, personal preferences). But those adjustments will always cost you some of that efficiency.
So if someone asks you after a strategy or tips you should always give him the most efficient way and tell him that he needs to adjust it to the needs of his own group. If you give him your already adjusted strategy he will even more adjust it for his group in in about 80% of the cases lose even more efficiency. Which is bad if they're already struggling with it.
Like i said before, efficiency isn't determined by my opinion, it's really simple math. And i expect healers to put up dots in their downtime except it's really a fight where they need to manage their mp for whatever reason.
Keeping you group up is fine, but many healers try to get their group topped off asap what is a horrible mistake. T8 is so scripted there is nearly no unexpected damage (exceptions are bad homing missile handling, mines and MAYBE someone gets a hit from a dread but how often does this happen? 1/100 trys?) but if you know those aren't coming in the next 20 sec why would you waste mp to top your group of asap? It's really just a waste of mp, nothing more.