Quick Update; details at eleven...
Jin'Rokh Heroic 25-Man was cake, even though I got hit with six of those idiot lightning balls. RNG still hates me, but with the Mastery over Haste build, using Living Bomb, it seemed to be all right.
Horridon and Council were Normal, as our guild is still progressing. We switched to Heroic for Tortos, and I stayed with Living Bomb, as the Whirl Turtles are usually too far apart for Nether Tempest to be truly effective.
25 wipes later, with tempers flaring, I was having an opening pull averaging something over 210K DPS (I know, but I'm still learning how to get Ignite/Combustion to really work for me), which dropped down to about 147K until we wiped.
Tomorrow evening (Saturday), we'll be trying it again, and I've reforged to the way that Spaace has suggested, with heavy Haste.
I'll post my findings and let everyone know what happened, and I'm hoping that there will be a big enough difference to help me to decide which is best for my play style.
Again, thank you to everyone!