I think it was intentional. They probably don't want the great sword and parasitic contagion % based heals to count because it would be OP or some such.
Were you able to get these numbers without the story instance buff? I'm not seeing any Harbinger ability doing anywhere near 15k+ damage. I have tried a number of builds. How are you getting these numbers?
Are Aetherlades special mobs? because my dark barrages are hitting for 1k-2k crit per bullet. No where near your screenshots there. I have tried against guards, normal mobs, champs, etc.