Elusive Imperial Pick

[Kisanzi]

For the past month I've been trying to find an Imperial Pick. (Yes, I'm a Bluefull and I've checked the drop charts posted by heyfool.) But the drop rate for both the creatures that drop the pick, gulgus-gue and dolmdari, are pretty close. I've done aroung 30 central dome fire runs and a good number of seabed runs but no dice. So I was just wondering which creature I should be focusing on? If anyone has an opinion or advice it would be greatly appreciated!