Let's face it, Stalwart and Sacred Defenders are great at what they do; with sufficient investment in their AC, they can stand up to punishing monsters (like griffons, whom I'd found out last night were quite capable of shredding anyone else to pieces... on epic NORMAL). The problem is, even with their current buffs to incite, they are incapable of grabbing and maintaining a monster's agro.
The reason for this is because ALL of the other players in the parties I run with are dishing out greater damage, and thus generating more hate, than what my tank builds are capable of. Put quite simply, their melee DPS is garbage, even with doublestrike considered. That all being said, their incite should be an aura that generates 300% agro with another 150% agro being generated per hit, and these tanks should have one of their stance effects granting them additional damage per blow (thinking 20%/35%/50% more damage per hit) when wielding a shield - Half that bonus if they're fighting without a shield (and only for main-hand weapons/handwraps).
Currently, the best weapon for Sword and Board tanks is Nightmare from the Lolth raid given it's high-utility abilities (specifically, the Negative Levels that proc on enemies).