For general arena telling us setups/classes your having a hard time against helps but it seems there are lot of things gear and talent wise you can improve.

I just took a random of your chars and wrote down what i felt about him..

Lets start with your gear.. I somehow disagree that getting 2 ele and 2 resto pices is the way to go, i rather have 1.5 second lower cooldown on my grounding totems then 50 resillience. (also you get critt on the elemental set rather then haste on the resto set)

Like you said you seem to know were the problem is with mixing your pve and pvp gear.

Your neck,shoulders,gloves,pants,totem is not good enough, also get seperate pvp and pve gear if not you have to gem for one of them. There is a blue totem you can get by doing all the venture co dailies south in grizzly, takes about 1 hour the first time and include an annoying quest but the totem you get is decent. (120 extra spelldamage on your lava burst)

You also bought the salvation deadly cloack and i do assume this is for mana regen but should not be nessesary for a elemental shaman.

You have bought lots of 19 spellpower gems that costs 70-80 gold each on my server while not enchanting cheap enchants like 18 stamina on your shield.

You lack enchants on:

Cloack (get 35 spellpenetration for pvp)
Chest
Shield

You also lack the "enchants" gained trough items on shoulders and legs.

Talents:

I cant figure out why you are specced enhancing totems and 1/2 points in elemental reach.
Improved shields isnt worth it either due to 15% on lightning shield means going from roughly 1k damage per orb to 1150.
Take shamanistic focus as shocks are costy and 45% less mana per shock is awsome for 1 talent point!
Speccing 5/5 in revebration makes no sense when you can get the double effect in booming echoes for 2 talent points (and extra damage on your flame/frost shock spells) Word to be said i realy like having 5/5 in revebration once im hit capped trough gear.

Gems:

Yellow is resillience since there realy are no good options
Blue: I prefer one spellpenetration gem and the rest stamina)

When you got the time level proffesions!!

There are roughly 1k hp or 50 spellpower in bonuses here but upgrading your gear will give you better benefits atm!