I personally think it was VoA but it would of also been during RoF, any warriors that played during VoA remember using AC aug in primary over proc aug?
Proc aug for agro faded as a necessity in SoD. I didn't personally use an AC aug in my weapon until I got back to raiding Arx - in group gear - so needed every edge I could get. Now I just carry Distiller XIIIs to hotswap with Insigni Saevus