The agility sets (ancient civilization armor feat) sadly do not seem to greatly benefit from the increased agility contributing to your armour.I confirmed all other possible influencing factors and equipped this set again to confirm no error on my part. Flawless Darfari Skin jumps up two heat protection points over the exceptional version, which does not follow the trend of the other armours.
Hyperborean Slaver armor swaps from heat resistance to cold resistance at epic quality and above.The Cimmerian and Lemurian sets seem to be a point behind the other epic sets when it comes to temperature resistance.Some sets do not increase the stats or temperature protection provided as they increase in quality, this appears to make them progressively less attractive (and in many cases seems to be an oversight).In pure damage reduction, light armours seem to benefit the most from a higher quality, and heavy the least.There is no flawless or exceptional versions of the Silent Legion set.There are no exceptional or flawless versions of the non-epic reptilian set.