Hey guys,
Found another farming method for anyone who may be having a tough time killing champion packs on their own in Act 2. It's pretty simple.
Go to the "Road to Alcarnus" quest in Act 2 and run around the Stinging Winds. If you're lucky, you will be able to find an NPC named Mehtan the Necromancer. After you finish his event you can kite ANY monster from the zone to the Necromancer. HE WILL KILL THEM FOR YOU!
This can be done on any difficulty level. The Necromancer can't be killed and he hits like a truck. Even if you do die, he will still kill everything you kited to him. Just rez after and loot after he takes care of everything.