I'm sure you see this all the time but I have been doing my research and I feel like I have hit a plateau with gearing/practical DPS.

My TPS Gear;
The World of Warcraft Armory
(If I don't have my 2% threat gloves it updated to another set)

I have low shield block value, currently at 309. But I have 10.75% expertise and 8.5% hit. I'm not sure where to go from here, there are small SBV upgrades but at the cost of a lot of hit/expertise. A real shield would help but I have only ever seen 1 tank shield drop of all the raids I have been to, including kara.

As a follow up question, what kind of TPS should I expect with this gear? I just want to make sure my rotation is optimal as well.