Here is a simple exploit my guild figured out while not wanting to reclear trash to Kalecgos. Your warlocks can farm soul shards that the Cabalists spawn. Here are steps for the noob.
1. Clear Kalecgos trash and start wiping on Kalecgos like normal.
2. When trash respawns, have everyone summoned where the last robot is.
3. Path back to one of the trash groups on the side.
4. Kill all the adds except cabalist and don't DPs him.
5. Have your warlocks spam drain soul on the fiend imps that he spawns.
6. You now are refilled on soul shards and you can just summon your raid back up each time you wipe!.
Enjoy!