I've been following this thread for quite a bit now, especially since 4.2 hit live servers. Still I'd like to have some advice from you about which way to follow as my "main" set, since this time around seems like Blizzard gave us pallies more choices to tweak our playstyle depending on the occasion.
Just to give you a clear scenario: my guild raids only 10 men, we managed to clear 7/13 HM during the T11 content (we started raiding a bit late and had to undergo through several player defections). We raid with 3 healers, beside me we have a disc/holy priest and a resto druid, so I often (read: always) end up healing the tank/s. Up to now I've been stacking haste/spi whenever I could, obviously using 4pT11 to avoid mana issues on heroic modes.
Now would you suggest to change to a Mastery equip/reforge/gemming to focus on tank healing for FL HMs and be more efficient? Or should I stick with haste/spi and only change for dedicated fights especially requiring Mastery? I know it's a matter that has been argued a lot until now but I've not been able to understand yet which way I should follo. Maybe given my particular scenario/healing setup you have enough knowledge to suggest me one of the two

Thanks in advance!