The buffs they had were: 3% increased damage (BM hunter), lust/hero/warp, 5% crit, 5% haste (of course), and some of the other mana/stat ones that aren't 'major'
Missing: 5% spell crit, 6% SP buff, 6/8/10% SP debuff (also, make one of your hunters pull out a Dragonhawk or Wind Serpent for 8% SP - the other hunter pet buffs are already covered)
Second, they're actually not 'crap' as you suggested. When I ran Rezzme through SimulationCraft (which shouldn't be taken as law, but merely as 'ballpark') at 50,000 iterations for a 300s fight with the buffs your comp provides for your shadow, it gave me the optimal, non-moving, non-button pressing DPS for them as 24,080. Keep in mind that your World of Logs does not include the shadowy apparition damage or the shadowfiend, which did over 300k combined damage and would add about 800 dps, putting them pretty much at 23k, for that attempt. So, your priest isn't doing too badly for what they have to work with. Just keep their dots up a bit more and they'd be close to perfect.
I also simmed their dps increase if a hunter pulled out a pet for the 8% SP debuff mentioned above - 26007 DPS. So.. I would suggest doing that. A 2000 DPS upgrade is no small thing for a very small change.