I wouldn't make any attempt to decrease your defense--it's not like you're gemming for it, and defense is still a very good stat past the critical minimum of 540.
Consider replacing your strength gems with expertise gems. I'm not sure exactly how much more or less effective expertise is than strength once you're past the soft cap for expertise, but it's something to think about.
If survivability and not threat is the issue you have in raids, I'd replace your meta with Austere Earthsiege Diamond - Item - World of Warcraft.
Grab a Armor Plated Combat Shotgun - Item - World of Warcraft from a friendly engineer, it's best-in-slot before Ulduar.
Last edited by Ossix; 04-14-2009 at 07:05 AM.
Reason: I fail at reading comprehension.
"The best way out is always through." —Robert Frost