Preface: No logs, only anecdotes.
Disclaimers: Yes I have a crap wand, currently farming GB for the one off Throngus. Same story for the trinkets, Core is on the first-purchase list for my VP (possibly tomorrow), and I'll have DMC:Tsunami as soon as the fair rolls around.
The sob story:
Well, I used to be a resto shaman. My small 10man guild was running double r-shams and a resto druid for our raids, and situations were sort of dicey. Holy priests were looking awesome, and I had one at lvl 80 so I figured, "Hey, I'll level that up, give us more tools in our 10mans, and be able to pick up my shaman partner's slack in healing because h-priests are OP, and we'll win more!"
Fast-forward to me now being a holy priest in our raids. I was able to gear up pretty fast, though I'm still 4-5 ilvls below my healing partners. However, I'm consistently 8-10% healing-done below BOTH of them in every single raid encounter (and a good 1-2k HPS lower as well). Magmaw, Double Dragons, Omnitron, the gamut. Even encounters where holy aoe healing is supposed to be ridiculously effective (Magmaw, for instance), I feel paltry. I seem to blow through my mana crazy fast (especially in AOE healing situations, though I've taken that as par for the course and time Chakra: Sanc for the best effect), and I use mana cooldowns fairly early in the fights to keep up (even using Hymn and Fiend together for max return, and Potion of Concentration later).
I have PoM bouncing off the tank on cooldown. I used CoH, Bindingx2, Chakra:Sanc and PoH for big AOE healing. I have Renew on both my tanks and keep it rolling with Heal when in Serenity state (most of the time). I feel like I'm using all of the spells and skills situationally correct and by the book, so why am I so terrible next to my other healers? The best HPS I've seen myself pull was a bare 8k HPS (and the r-shaman was easily 11k in the same fight, with hardly a dip in his mana). On average, I'm around 6.5k while my fellows are about 8k.
I'm taking it personally, haha. While on my shaman, at the same gearlevel and spec as the other shaman, I was always ahead of him in effectiveness. As the whole reason I changed class was to bring an even better healing class to the table, it's driving me crazy to be so weak in comparison.
tl;dr: I feel like I'm playing my holy priest right, and my gear isn't absolutely terrible, but the numbers aren't showing it. WTF am I doing wrong?