After 5.3 hit, I switched over to use offset pieces instead of t14 4set.
With some fights going well, I'm usually below what I used to achieve and am having mana issues at later health.
Logs are obviously less "huge" due to a disc priest but I still do not like the current outcome of most tries on Lei Shen 25HC.
http://www.worldoflogs.com/reports/rt-06iqa5db1oibveft/
Usually using flash of light on lucidity proc, EF the tanks and the occasional melee - for the rest it's mostly radiance.