I had the same impression for a while, i was really thinking that AOC was only working for BM, while not for my off spec (Surv), neither MM after i respec'd. Found the solution though! Try swapping the trinkets from their slots, or maybe just putting AOC in the bag and reequiping it... To me it worked.
" So much lost time... that you'll never get back!"....
sv is awefull right now,i switched to mm and its miles better even for pvp,also i tested full set of pve/pvp gear and pve is still doing alot more damge which i thought was supposed to be not the case anymore?im no expert tho so i may have missed something.