just solo'd him on my mechromancer. i got him stuck in the glitch spot and i just hid on the far back by the ammo spawn near the lift. his fire/acid never touched me and the adds that randomly spawned never made it past DT. as for pete i just used a few stacks of anarchy but mainly used slagga and CC (slag) as well as the bee shield. also i would use DT to lower his shields and health a bit to save some ammo. he would jump up but never managed to get back down also when defeated he dropped all his loot glitch free.