Gear is part of the problem, as you'll need to start replacing those Hateful and PvE pieces with something better to stack more resilience.
I'm not sure gemming straight Stamina is that helpful - consider Stamina/Resilience gems to boost your Resilience rating (sub-1k is pretty low for a cloth healer) as long as you have the hit points to survive an initial burst, as past a certain health pool damage mitigation becomes more useful. Particularly since your partner is a Rogue and should be able to peel, you won't need the extra hit points just to survive a single DPS sticking to you. If you're running into mana problems, consider using the Insightful meta instead of stun duration reduction.
As for talents, I would consider dropping some points from Inspiration (and perhaps Holy Spec) to flesh out Grace, Renewed Hope, and get Martyrdom. Switching Silent Resolve to Absolution might not be a bad idea for mana issues, but keep in mind that there are a lot of priests in 2v2.