Parsers don't lie. If your rotation gives higher numbers on dummies than his, then yours is better. One tip I might add is that when you have to be on the move because you have to dodge stuff I would recommend you cast scathe. is instacast and at least lets you do some damage at a time where is impossible to cast your regular rotation.

We do Garuda HM in our FC and we allways go with a BLM. Its single target DPS never beats our dragoon DPS, but is still good. But the best thing a BLM brings for us is its limit break.

After 2 HR, DPS must kill the regening sister ASAP (hopefully it will be the one that spawned near the group). then the other sister. I as a tank pop my hallowed ground there to be able to take Garuda's Hits while shes buffed and give a break to Whms.

Then comes the clockwise kiting, use scathe if you have no time to cast regular rotation.

Then comes whirlwinds at the outside and everybody to center.

And this is where our BLM shines, when we are at center and the sisters spawn again and are all nice in the center, our BLM uses limit 3 on the area, one shoting both sisters and leaving only Garuda standing. You Just gotta learn how to time it well so you kill them both ASAP. If you use limit to fast it will miss one of the sisters, if you wait too much they will Regen garuda anyway.

Its just awesome AOE power =).