Great video and thank you for the strat, my guild will be trying it tonight. Just thought I'd let you know that if an extra bomber shows up, you can have a sage or someone CC him an let his timer run out, so it won't bug you.
Here is a picture that I drew up that explains where all the purple fire falls:
Don't mind a lot of the notes around the edges, that was drawn up when we were first doing HM Kephess. The stuff in the top left corner is still valuable though, it gives the order of the fire drops.