Originally Posted by
Yunzi
When in doubt, use items with more spirit. Spirit's bad for parsing, but good in any number of situations - when some players die and the fight goes on longer than you were expecting, the extra spirit can avoid a wipe. When your best throughput healer dies and you need to cast more PoHs than usual, the extra spirit allows it.
When you're casually farming a boss and there's minimal chance of unexpectedly bad things happening, that's the time to maximize throughput.
Also, different bosses have largely different durations - you'll swap out gear depending on the encounter.