I've mostly got it down now, it's yielding around 75k per hour. I think I can push around 80k if I get a little more reckless, but I'm tired of summoning new voidwalkers every 2 fights.

So 75k isn't bad. I get 35-40k regular grinding. About 100-120k from fresh quest zones, but that quickly drops down to 50-80k once the quests get spread out and I'm stuck with collection quests.