Garuda Extreme proved to be rather painful for myself. Granted, I attempted with a melee DPS and essentially regretted life after that (no, seriously, tornadoes are your enemy).

As for Ultima's Bane, I don't know where your struggle is.
I had a couple of wipes and it actually ended up being my fault that we didn't get by Ultima (e.g., I limit broke on the second phase, I didn't limit break at all, I essentially failed so hard that my family would probably be shamed, but this was as a tank), but otherwise I have very little problems with Ultima if people just understand to get together and spread the damage.