Like the bracer of benevolence, I would guess the best armor achieveable are probably things that drop from the West waste dragons, using scout giants.
That's probably a 6 neck, and the non -bp
https://wiki.project1999.com/Matchless_Dragon_Armor_Set
Other strong options are exquisite velium weapons and flayed paebala gloves, by dragging paebala and chetari to each other and kill stealing after the paebala does most of the work. DN is fairly dangerous to be running around, but I think it is viable to do a train from chetari to paebala.
There's probably some specific things that can be improved over this, but it's harder because there are not that many good drops from zones where you can make NPCs fight each other to do most of the work.