Dark Horizons unusable items

I love the Dark Horizons mod, but some of the better items in it, like Duragon's Plate+3 and that shield the paladin carries in the Friendly Arm encounter seem to be completely unusable. I thought this might be by design, but some of the items for sale also suffer from this. I've even tried to drag items into editors to find and fix issues, but they still don't work. Should I just look for an earlier version of this mod, and try to replace the items, or they just hopelessly bugged in all versions?