Setup I use most is: Pld, Whm, Blm x2, Drg x2, Brd x2

First part before AF is pretty simple. Brds and Drgs(keen flurry Ring of Talons) kill the plumes. Dps to around ~65% hp and she'll jump for the AF plumes. Take care of plumes and Dps garuda down to around ~40% hp so after the AF she'll skip her second phase and go straight into spawning Chirada and Suprana.

Pld flashes group and vokes Suprana. Pld tanks Suprana and Garuda at the same time while a blm is most likely to be tanking Chirada. Pld covers Blms as needed. Rest of the group stand behind them so they don't get hit/stunned.
Kill clones and Dps garuda.

A) If Clones spawn again. Determine if you can kill garuda within the minute or again kill the clones before they blast you.

B) 3 tornadoes cover the arena(2 on the outside and 1 in the middle). Run to the outer rim of the arena and start moving in a clock-wise direction with the tornadoes. Kill the plumes that spawn during this phase.

The main thing you need to do for easier wins is skip the second phase after AF and have Suprana/Chirada spawn right away.

Kinda tired writing this. Let me know if anyone has questions. May post a video later of our garuda fights as well from a Pld point of view.