10 or 25man?
For us on 25man its mostly the same as normal version, except we use 3 tanks on heroic.
1 Tank that tank all the time except during feud.
2 Tanks that rotate the double attacks, which ever one was doing soaking before the next feud, tanks that feud (when bot is offline).
When I say they rotate, they dont rotate every single double attack. The change happens after each feud the next soaking tank will take all the double attacks till the next feud.
So when Feud start, the next paladin on rotation LoH the tank that was soaking, and that tank uses shieldwall on the 1st double attack, which mean it should lasts long enough to take a 2nd double attack during the feud.
Other than that, rotate raid walls for feud and heal like crazy, and dps like crazy.
In our last kill on him, we managed that almost no DPS died after the 3 tanks during the final phase. I think thats pretty awesome.