I'm wearing practically a full set of champion pvp gear.
*Sigh* and now we enter the PvP gear vs. PvE gear issue I've seen way to often. IF you're wearing full PvP gear and attempting a hard mode operation, that's your problem right there. Especially if the rest of your raiders are doing the same thing. Run the others in normal mode till you can replace that PvP gear. (The expertise stat does NOTHING for PvE content whatsoever). Not sure why people think high level PvP gear will hold them through hard raids.
*edit* Oh those other stats like power, surge etc, are actually better on the raid PvE gear than your PvP gear.