I just tested the armor today, the result seems strange. Here I list my two characters' data.
Fel'mor: 780 Armo ; Z'dar: 214 Armo. When I played in area XI in normal difficulty level, Z'dar took like 70-80 damage from rangers and Fel'mor took almost the same damage (sometimes even higher, like 85). How could this happen? I tested in many missions and still got the same result. Hope the Glu team could deal with this problem as soon as possible.