On my bad, I forgot it was insane haha. i was thinking easy, medium, and hard. But yea, I meant insane.
Item boxes non stop are slower because you'll run out of money unless you only do one of those high gold missions, but if you do, you wont epics get from fortune boxes.
I do pure boxes until I'm down to 2 million cash and then go back to this way until 10 million.