In solo healing party, yes, but that's because you kill each sister in about 20 seconds and should only go through one tornado phase at all. You aren't racing plume stacks; you're just too far ahead in DPS. If your DPS is that high, just don't bother moving Suparna. You'll kill her before Garuda can WW anyway. You can actually do that much damage with two healers if your DPS are good enough.
What? Lemon8or was talking about provoking Suparna, not the spiny. OT can always provoke the spiny at the start of the phase, and has no reason to provoke the spiny a second time.
Minstrel Shriek only occurs at the end of the phase. Since LB2/3 makes your tank immobile, you'll want to eat the explosion from the spiny rather than risk being outside the bubble when the cast goes off. Generally best to have a SCH bubble here as well because it'll still hit everyone for 4k. It's really just an alternative to solo heal method, since both methods should have you finish Garuda before the second tornado phase ends.
That would be your own fault. FoF + RoH combo. Again, for the entire fight, your goal is not to panic and run in circles hitting Shield Lob. You have ~20 seconds before tornadoes appear at all, and MT won't have more than 1 stack from eye phase. You can start your combo on Garuda then hit Chirada when she spawns. Garuda is vulnerable for the entirety of the eye->tornado phase transition, but even if she weren't, you no longer need to deal damage to advance combos.
As noted above, that happens when your DPS is high. It really doesn't matter; you can provoke Suparna once it's up (safer) or just let melee DPS go across the tornados and kill Suparna where she stands (technically riskier, but if you're killing Chirada that fast, you should have no trouble downing Suparna just as quickly).
Tornado phase is 90 seconds. Transition is another 15 or so. During that time frame, you use Provoke twice. Garuda does not ever jump out of tornado phase based on DPS. You are using provoke on something you shouldn't be.