Wouldn't it be easier to kill the first three bosses and then pull those packs with the technicians after him? The technicians have like 15k hit points which should be doable and if you kill him at the edge you might be able to loot and run out without getting teared apart by the rest of the pack. If you get back in he will be respawned as you didn't kill the whole pack. I also think there are two technicians in each pack and they have a drop chance that is 4 times as high as the one of Krixix.
Ranged should do enough damage to hit and run and loot after they zone back in. Corpses should remain on the ground. Just an idea. Don't know if you can survive the packs though.