I am blessed by RNGesus. I cannot do the last map for sure so i am farming the one with 27% drop chance and i got like 8 drops of her with ~12 runs, already -5CR and +5CU after just 6 feedings. I also dropped Calliope like 3-4 times and Alissa once. I dont rly bother to focus on CU more then 5 atm im just farming the silvers to make me an perfect silver witch/healer wich is actualy harder then to get perfect Rita for me... kinda funny. But hey i have to get lucky somewhere dont i?