Quote Originally Posted by nonsi View Post
That will put Rogue 20 vs. Fighter 20 at DR 3 vs DR 16.
That kind of disparity will make the Unfettered Warrior character concept an obviously inferior choice and shift the meaningful difference from the character to his/her gear - the exact opposite of what I'm aiming for.
Make armor penalize AC and give significant DR. Now instead of wearing heavy armor and getting both, you need to decide which one you want more.

Then give a nod to the acrobats wearing full-plate and remove all Dexterity caps -- you can have both, but you pay more for having both, and your AC won't be as high as someone who only focused on dodging.