This is by farm the best farming I have ever done id say roughly 200g/hr consistently with both methods.
Step 1- have a rogue between level 67-70 decent gear I did it with my rogue at 67 6/8 bloodfang gm weapons was pretty easy.
Step 2- make your way to the part of the instance where the humanoid mobs are named like crimson monk, initiate, courier, etc.
Step 3- kill as many of these humanoid mobs as you can with the smart use of blade fury, evasion, adrenaline rush, blind and any other tricks you may have you can kill practically every mob.
Step 4- kill all the mobs you can they all have a chance to drop righteous orbs plus other goodies and once you reach the room right before the final boss where Archivist Galford is wait till all your cooldowns are up and just whack away at him he has roughly a 50% chance to drop an orb and a bop blue. Take off all your gear let the last boss guy kill you then release as your running back reset the instance and start over.
Having enchanting is really great while using this method I got a lot of the tier .5 set pieces and would just disenchant them the large brilliants sell great. You will also get tons of crappy greens you can disenchant for eternal essences. I also happened to be able to do the crusader enchant so with all the righteous orbs and large brilliants I would get id have enough mats to do 1 crusader after a run or two. So once I got tired id hearth back to town and sell crusader enchants to people usually twink for about 150g per.