I have been camping Sro for four days nite and day all times and cannot spawn the AC..Killed everything and tried the Strategies posted here .It truly is random and i could be unlucky but i am moving to OOT ,there is a set spawn point and i will be there for as long as it takes.Good luck and stay tuff..
Flazor 52 rog
Rylanya 47 ranger
Tuninyu 44 Bard
Kastinonyu 25 Shaman
Fennin Ro