I'll add my tanking tip for Garuda. I've not seen anyone else do this in my runs.
Basically when grabbing Garuda+add, I "circle tank" to bait skills. I mean I basically just run through the birds so they have to turn around to face me. This way I don't really even need to look at the cast bars, and don't need to have one targetted and the other focused. When one of the birds stops moving, she's casting slipstream, and I'm at her back. I keep circling now but avoiding the aoe cone for the first bird, until the 2nd bird also stops. Usually at that point the first slipstream has gone off. Then you know there's no more slipstreams for a bit so you can just stand there.