My question more is how does the armor rating of the piece you're trying to mod determine the over all armor of that piece? For example:
I have Force Evangelist's Shroud, with an armor rating of 80. How is then the armor determined to be 257? And when I add something with, say, the armor rating of 85, does the new armor value become calculated?
A Light Armor chestpiece with a rating of X, has more armor than a Light Armor Chestpiece with an armor rating of X-1.
Oragne, Blue, Epic, Green, whatever it is.
Different levels, same rating, different rarity, same armor.
AS LONG AS IT'S THE SAME ARMOR TYPE.
No, you will not be able to tank well in your slave girl set as a Juggernaught. Because it's going give you CRAP armor. Because it's light. Regardless of the mods you give it.
Does this answer every question?