On the Adjust tab you can add adjustments to increase/decease your AC value as you wish. But you will need to turn off/on the adjustment as you turn on the rage ability.
If you have the
Community Pack installed turn on "
ShadowChemosh Adjustments". Then you can add "
Class Ability: Values" adjustment. From the first dropdown select
Rage (Unchained) and the second drop down select "
Value 5". Then set the counter to +2. Now when you activate rage you will no longer get the -2 penalty to your AC.