Make sure to refresh E-Stars
not necessary because estars and mystic auras dont stack, and you get those permanently at guardian missions. estars is a waste of dps.
also, make sure u use metamorphic blast every 3 hits, as the +50% critchance buff is very beneficial for your dps on priest. never use shocking implosion or vortex without metamorphic blast buff. make sure you use manacharge fully charged before popping edict of judgement so you dont waste time on charging it, while also benefiting from maximum critdamage buff during half of your burst phase.
ideally time that with repositioning yourself. don't refresh manacharge when its off cooldown unless your edict of judgement ran out, because you don't want to waste those last few seconds.
prioritize holy burst > meta+vortex > meta+shocking implosion, which leads to a very simple and quick rotation. use little downtimes for kaias and nemesis, as its not always on the boss, you can chain 1 hit nemesis into final reprisal right away. only use final reprisal if you have the glyph from shocking implosion active.
this usually puts me in top5 without combat accelerator, only bravery, on an average day while watching a show.
sorry for formatting, typing from my phone