I still don't know if I like Knight for this. Here, this is what I'd do: start with TSA, Masterwork makes it -7, Nimble makes it -5. Since you're going with ridiculously heavy armor, you're probably going to want Deflective Armor, so Heavy Armor Optimization knocks it down to -4, which meshes perfectly with Dread Commando. Combine with the Tooth of Savnok listed above, so your movement is unimpeded, and a Restful Crystal, since you can't remove the armor while using the Tooth, even to rest, and you're golden.