I want to mention a little tip when dealing with non-loading bosses in FATES (I use the ps3 also). I am sorry if this was mentioned in your video, I will be watching that as soon as I get a chance.
Target another player who seems to be successfully hitting the enemy or even a NPC and type (or macro) /ac "Fire" <tt>
Obviously, I'm a THM and this specific instruction will work only for THM. But the important part is the <tt> (target of target). I am able to get a few hits in while waiting for the enemy to load on my screen. I am sure you can position yourself within your spell/skill's range and tweak it to successfully hit.
I apologize for the brief hijack.I hope this helps someone.