As it stands:
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Fighter Perk
10/5 damage reduction, up to 30 total damage. +1 positive energy damage for charisma modifier. Lasts 1 turn.
Level 1
Deflect Arrows
+1 Reflex Save
Level 5
+1 AB and +1 AC when using a medium weapon while the offhand slot is empty.
+1 AB and +2 positive damage when using a small weapon while the offhand slot is empty.
Level 8
2/- Physical DR
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The /c fighter_perk bonus damage doesn't stack for small weapon users, those who, in my opinion, should have the handicap. A simple change to another type of damage so they stack would be a possible fix. Should this be seen as too much, the amount of damage could be reduced, as long as they stack.
Thanks