I also made some similar mistakes to your train of though in the early days - don't think AP, think crit. Honestly the burst from crit is superior. I've gone through enough maths to verify this claim, PvP is all about burst, and that's where crit > ap.
You should be taking expert goldminers hat, without question. It's 5.5% reduced avoidance from the front, which, unless rogue, means you will be seeing dodge/parry happening, on average, half as often. Do it.
With the spirit nerf outside of the mp5 rule coming in, i might even consider a 12/12 of the monkey hat also. Medallion over medal of courage - really max out that crit percent. 9.22% is far, far too low. Take Revolosh Spaulders of Monkey any day, for the dps and the crit - don't worry about mana, you're going to be dead before running out. Robe is a great choice. Personally i'm more comfortable with the HP argument after the nerf, so i would stack as much stamina as possible, so take 150hp on chest. A ret paladin is going to take you out in 1 burst with that much HP.
As a shaman your burst is pretty high anyhow, and with some high crit, it's going to be impressive, i'd stack more stamina, take 120HP on the bracers. 24AP is honestly, a negligable amount. Think survival = more damage in sustained fights. 35AGI on wep is far, far superior to 70AP, it's 35AP, a nice boost to avoidance, and 3% crit. Basilisk Hide pants over the warchief kilt. 21Agi, and 8Stamina are the stats you need - also replenish some of your lost AP.
Ogron's sash is superior. You don't take 6AP over an extra 5 stamina, and 0.6% crit. +15 Hit rating to gloves + the 18hit from the head piece in the 3.1 revision, and you have your hit cap - the hit cap is not negotiable, it's essential. Don't look at it as "oh, i've only got a 3.5% chance to miss", look at it that over a sequence of 10 moves, you have a 35% (from successive probabilities) to FAIL.
If you spec your gear just right you can have something like 18% crit chance, and 2200hp with 400ap, more avoidance, and hit cap, which is just so superior, in PvP terms at least, to what you have now