I just ditched my SP at 80 and converted him to holy. He was doing bad dps and going oom quickly, too. Not doing SW:P on trash is essential, like everyone has said. I do use SWin my trash rotation. I also have Mind Sear (don't recall if you have it at 79) on an AoE hotkey. I usually do Mind Blast, SW
, MF, MF, MF then repeat on trash. You may need to do some tweaking with 4 priests.
Your gear is horrid, but that's what you are working on, right? I did dps = to 80% of my Spell Power. That's terrible, I know, but it was about all I could manage until the very end. I tweaked my spec and macros and managed to do around 2700 dps with 2450 SP.
You can check out Coventar and his macros to see if you find anything useful. My DS is still shadow.
One side note, it is definitely worth keeping SW:P up on bosses, but you should only have to cast it once if your talents refresh it. Also, making sure Shadowfiend was out 100% of the time is was available and having a hotkey for Dispersion
Good luck!
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