I never had a problem with Pandemonius. I never used Aura of Retribution for anything, and still have no problem doing enough tps to effectively go all-in on dps (using Avenging Wrath naturally). Buff salvation on which ever of your toons do most threat to lower the dps threat ceiling as well. Avenger Shield alone should be enough to cover 2 normal fireballs/shadow bolts. Also, are you judging crusader? And applying Seal of Righteousness after that? You should probably do around 5-600 tps pretty easy.

Shaffar on the other hand, there's a decent challenge. I wiped 2-3 times before I took him down at level 64, and when I killed him, I still wiped by his adds and had to resrun from the graveyard, hahaha! He is unpredictable for sure. Some might think just nuke him down, but it's not really that easy. He mixes his attacks with both melee and spells, and if he decides to go and melee one of the ranged dps, who'd take aggro in a nuke situation, you'd probably not be able to save them. The trick here is to have a tank who is able to move, and keep up with Shaffar on foot when he frost novas and blinks out of range. You have a blessing that's tailormade for this type of encounter. /cast [target=player] blessing of freedom. Also you must position your dps/healers as far forward as you can without aggroing him, and be prepared to run them forward, if he blinks back behind the pile of skulls or dirt or whatever.

You should maybe multishot in the start to bring the adds into aoe range and dispose of them quickly with arcane explotion and hellfire, from here on out only dps Shaffar. You're gonna be left with 3-6 adds probably, but they go down fast in human form also. See, having 2, 3, 4 Shammies in the party would make this encounter almost too easy. One chainlightning in the beginning would rid you of one problem in about 2 seconds. Boxing 5 different classes in this encounter actually demands some effort. Good luck :thumbsup:

Edit: Actually I don't remember if the adds will move towards you or remain stationary and fire spells. You have alternatives though. If they approach you 1x explosive trap, hellfire and arcane explotion should take care of business. If they remain by Shaffar you could maybe start with 1x volley, rain of fire and blizzard just after you pop consecration. You can of course manually target one add each with your 3 dps, and do an assist on Shaffar after they're down. But I dropped killing adds after the first 3 were dead and just went for Shaffar. The encounter is waaay to chaotic to keep up with adds. Almost like Darkweaver Syth in Sethekk Halls. I just popped Avenging Wrath when the second wave of elementals spawned (to help stay above the healers threat), and nuked away with no regard of adds. I actually bound greater heal to the same button as I cast frostbolt/shadowbolt/lightning bolt, so I just had to spam that one button every 2,5 seconds. Worked wonders when underleveled/geared.