For science (boredom) I updated my tank-swapping sim to better gauge the T18 set bonus strength in ideal-ish scenarios. The bosses are dealing mainly physical damage, I did a more magic-heavy one as well but it looks pretty much identical.
http://i.imgur.com/Z8fSzBe.png
They're all the same gear and talent setups (DT, ER, US, DR, Vig (not used), BB, Rav) unless it says otherwise. Due to reasons and stuff, results are slightly different depending on which dude tanks first, so I just labeled them all whether they are the first or second tank. Each pair takes turn taunting the boss at 30 second intervals and does pretty much what you'd expect a Prot War to do to maximize survivability over 30 seconds. They all use Last Stand for the second half of their turn tanking, at either 180, 120 or 60s intervals depending on 2P/AM. The ones with "Fancy" in the name will forgo some SBlock uptime in order to cast more Barriers while Last Stand is active. The others will just use SBar as a rage dump, similar to the default APL. So make of that what you will.
I did something similar for trinkets, but I heard from the bnet forums that simc might not be modelling WUE correctly so I think I'll hold off on posting them for now.