Our tact is not a standart one, as we are still working on it. Most groups we fight with are 5/5, so I believe they include your bracket too. Main idea is have rogues fight each other, so that you can dps easier, and cc priest after he uses his power shield, to finish off rogue. In the meantime, you'll probably have to hot your partner, abolish+regrowth is prefered.
Primal tenacity is valuable here, to avoid long-time fears while trying to heal. Also try take a pain dot on yourself, for blind immunity.
If you fail to find rogue at the beginning, you can start pounce mangle priest on the move, and go some distance away to shift bear take rage and demo shout to reveal rogue.
From most videos I've seen, and cases I've fought, it's better to try kill rogue, and stun-blind-charge priest when rogue is low hp. However, there are some cases where priest keeps healing rogue, and some god burst shreds can take 50% of his hp quite easy. You can maim shred at that point and call for a ShS of your rogue to stunlock him to death.
Note that as I mentioned this tactic isn't perfect, we're working on a counter for this group, as we face it quite often, and it tends to be a hard one. Any time we tried to nuke priest, it ended up with rogue dpsing me very hard/killing me eventually.