Abyss Astrolabe Fail (Bug/Oversight)

I'm constantly failing Abyss astrolabe condition for multiple reasons

1. mobs just aren't spawning from the abyssal pits in high enough quantities or not spawning rares at all
2. This has to be an oversight but why the hell is frostwall and run away mod available on a abyss mobs? this just causes the abyss to fail because one rare ran to the other side of the map in the middle of completing the abyss which of course means you didn't kill enough mobs and the abyss fails. or you try and catch it but doing so means your not killing enough mobs and the abyss fails.

Bug Report ID: #3,425,638,783

I've had the same issue trying to complete the Astrolabe stuff.

Clearly happens when the Abyss spawns in a corridor or near to a wall, simply not enough minions spawn to complete the event