One thought I had in those kind of scenarios would be to have a modifier that allowed all 4 Warriors to attack their own/current target and NOT assist until after you have built up solid aggro on each mob on a single warrior such that the incoming damage isn't too high on any single warrior. After you solidify the aggro you can then turn off the modifier and focus DPS on one target at a time until they all go down. Even against a 5 pack a given Warrior should have at most 2 mobs on him and you could try to make the 5th mob could be the mob focus fired down first to keep the incoming damage spread as evenly as possible. You could even try having the Shaman cast a slightly delayed shock on the 5th one to give each mob a different target to DPS on.
If a modifier was setup it should, in practice, be kinda like how Mage groups target a different mob to sheep before starting an engagement except that everyone continued to attack their designated until aggro is solidified (and then the modifier is turned off)...
If you didn't want to mess with a modifer you could maybe have some DPS keys that were not FTL/assist enabled and use those keys initially and then switch to your regular assist based DPS keys.
Please try this and report back if it helped or not.
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