edit/update:
We have ran another 3 blighted maps since, 2 of them crashed the same way. The third we were able to complete but one lane had frozen mobs (seems like some type of anti-creepblock measure) that were invulnerable making it impossible to finish the blight. The biggest contributor to lag is the number of party members, so perhaps it is solo-able without crashing; I would advise holding off on running your maps anyway due to the frozen mobs bug.
