Ok, I started a thread a while back, asking folks to help me fix AC. The general consensus was that its a futile task, given that AC is very "Swingy" and hard to predict.

After some thought, a potentially simple solution occurred to me:

Make AC (or Defense in this case) equal to the characters Base Attack Bonus. Modify it with the highest of Dex/Wis/Con.

Armor is DR X/--.

Would this work, to some degree?