Epic Fiend not using CDs

[Hedgewizard]

Hi there. I've been playing around with all the blackguard epic fiends lately and I've noticed half of their cooldown abilities are not being used which are listed on the wiki. Each of the three creatures have something not casting, the Balor, Pit Fiend, and Ultroloth Commander.

Ultroloth Commander isn't using it's fear gaze (CD) or finger of death (CD)

Balor Lord doesn't use Destruction (CD)

and the Pit Fiend doesn't use Improved Invisibility (CD)

As it stands the Ultroloth is outperforming everything in my opinion due to the fact it can imp invis itself while the others just hack and slash currently.
If this has already been reported or noted, my apologies!

[Aren]

All these abilities, except from the Imp Invis on the Pit Fiend, were removed intentionally. The AI have issues with spell -targeting, and will often be trying to target an enemy with a spell, and do nothing for several rounds. This had serious implications in both PvE and PvP scenarios, as the summon could bug out, and cost you the victory. It made for very frustrating gameplay.
The only spell on that list that *should* be working, is the Improved Invisibility on the Pit Fiend. As far as I know.

[Morgy]

Damage output from 1 round of high damage attacks is far superior to a weak DC spell that can be interrupted with damage anyway!