You aren't using enough CD's. The vigilance is being applied way too early along with your Last Stand. You are using your SBarriers too early when Vengeance is still low and before it even starts. You also used a SBlock in there which wasted 60 rage. The armour potion does nothing because as was discussed a page back the Blood Rage ignores Armour. You don't use Demo Shout or mention about using it later.
- You need to coordinate Externals to cover the entire period and make sure they come at the right time. Set up Weakaura or TMW to track these so you know what is on your and how long it has left.
- Know your own CD's and use them to cover the entire period as well. If you know your raid can kill it before the 2nd Blood Rage then glyph Shield Wall for the extra 20% DR.
- Use your rage wisely. Go in with close to max rage and use a Barrier after the first hit when you have vengeance.