I was going to wait until I was BiS before trying it myself to give myself every possible advantage, I solo'd Queztacoatl way back in 5.0 after similar grievances about DRK sustain. That was just a dungeon boss though.
But if someone gets to solo DRK P1N before I can get full i600, I wish them luck, otherwise that's my pre-6.1 goal if it's possible at all.
