Perhaps 800 plus scores increase the chance of plans from Aldebaran? I have gotten about 8 plans from Aldebaran and 2 plans from Minos. But 5 of my plans from Aldebaran were from 800+ scores. I have only gotten 800+ scores about 8 times ever, while I get 2-3 700 scores per week. Hence, I get plans FAR more often from 800+ scores, yet most of them come from the 3rd Boss, not 4th.