Get a CTC macro (should be easy enough to google) if you want to play around ingame. You can also use chardev to play around with gear and CTC.
I would suggest the hc shannox belt and hc firelands neck to increase expertise a little but I see you haven't done firelands on heroic. The only real option would be ultraxion ring and reforges but with the 15% debuff this week extra dps from tanks really shouldn't be needed, tiershoulders can't hurt. Use expertise instead of strengthfood though.