Shadow Spec for Leveling the Priest

So i was going along with my previous post about leveling as holy, which seemed fine.

Then i got into a group for Nexxus and it just sucked, wiped about 6 times on the last boss before we called it. So two hours later, i was only 200k exp better off.

As i really want to start gearing up the priest for PVP and Arena's, i just want to get to 80 as fast as possible really, so i decided to spec Shadow. I know its probably the obvious leveling spec, but dam, it has some crazy dps and i dont seem to go OOM that quick either really.

I was just farming lower level animals for some quests in Dragonblight so i guess that may have had something to do with it, but mindflay was ticking for about 800-1200 and it can crit now! I wasnt even bothering to shadow word pain the mobs. Cant wait until 75 when i get the AOE skill, although that does seem to burn through a bit of mana at around 800 per cast or something.

Maybe that still has something to do with the DPS Bug?

Anyway back to grinding ;)

Here is the spec im using at the moment. 13/0/52.