Low Shadow Priest DPS
Not quite sure why you picked up the holy set piece for PvE gear...the haste gain isn't THAT good. That being said you are about 200 haste (little less) from reaching your 2nd haste plateau which will add some time to your DoTs. If played right this adds a good enchant's worth of additional dps.
Looks like you need a 2nd PvE trinket, the shadow-pan assault trinket works for me just fine. That alone will help boost your int up which atm is a bit low.
Same can be said for most of your other PvP gear...you are losing a ton of stats on PvP stats which would explain your current DPS. This also has the side effect of making your current Ilvl a bit misleading. The stats you are getting from your gear actually put your score a bit lower for PvE. Keep doing that valor grind and keep replacing that PvP gear and your DPS should improve.
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