Try this setup (I actually have a lot of experience on it):
Weapon: Cwand + Recomp (you’ll never need the 10 range… well… almost never)
Ability: Prot (main), Puri (other main/every situation Prot is bad in), T6 (speedy/quick heals – you’ll be stationary for the most part when you need spam heals… so speedy won’t interfere… and it’s only 5 mana more… which is nothing for you, given your pet)
Seeing your pet is fairly good for MP heal… you don’t need the T5 tome. You can just rely on Prot/Puri for most heals. (And Prot makes you take less damage for a while after too!)
Robe: Use Watersilk: You’re able to perma-prot and your healing makes your def not that big a deal. So trade some of that def for offensive stats.
Ring: Pyra/Bracer/Another offensive+defensive ring.
You’re already ranged, so you won’t be hit too much in the first place. With your Prot and your pet, you should be fine with a lower def. The rest is just making you more able to solo-priest (make clearing and things faster).