@ Elapsed
Hello! Just some quick things I noticed.
1) Ditch every single 160 int gem, there's a guide to gemming halfway down this page
here
2)
He should be specced into Solace and Insanity 90% of the time it doesn't look like he uses it looking at the logs.
3) His glyphs are weird/pvp'ish, glyph of vampiric embrace can make it a pretty useful raid CD (esp for 10 man)
4) This is jst my personal preference but since shadowpriests having to move severely hurts dps, I like glyph of mindflay and pandaren's step boot enchant.
During Twin Consorts he used PI on cooldown whereas on Horridon he used it 1 time at the end? Horridon's a wonderful fight for shadowpriests, doing 130k is far from what his max should be.
I think him having a weapon upgrade or upgrading it 2/2 would be very helpful. With or without LMG/2pc, he's definitely underperforming. I hope some of this helps.