I have a 542 ilvl shadow priest and ran normal 10man last night.
Here are some tips for the fights ive noticed have helped specifically increase DPS.
Immersius- Stay to the left/right of the boss to avoid taking direct damage.
When adds come out you wont have enough time to dot, they last about 4-5 seconds.
I would keep dots up on boss and save Divine insight procs MB and SWD when the adds came, a well timed halo helps hit 5-6 targets. Because the black bubbles shift around, its hard to hit every one. Another option is to mind sear on a fellow raid member within range. I ended the
