Stacking Mastery for Holy
here this might be of some help
the mastery shields are generally a lot of your healing, because of the perpetual amount of AoE damage in raid encounters and in 5mans. if people take a little small damage, you can get them to full AND have a good size absorb on them for the next time they take damage.
haste loses its luster also because of hasted casts (from passives). you don't need more haste when you've got a hasted HL/DL/HR. if you're playing whack-a-mole with holy light for some reason, you might like haste a bit more, but generally the absorbs from mastery will give you more throughput from doing anything else.
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