BRD AOE

[Maduro]

Is there a limit on how many enemies the BRD AOE can hit? I've noticed the last few times on Sastasha Hard when the tank rounds up a bunch of enemies, that some of them don't take any damage from my AOE. It looks like the tank has them all grouped pretty well and I normally try to target one in the middle so it will hit all of them, but on almost all occasions it won't hit all of them. Because of this I've been leaning towards multi-DOTing the groups because I inevitably have no TP left after the first group dies when I use the AOE. Is this the right thing to do, or should I just burn all of my tp, turn on Paeon and then just slowly kill the last stragglers?