My CLS thrawn and asaaj are all gear 12 ackbar g11 and bb8 g10 and I have no issues clearing phase 3 and 4. The only reason ackbar is so high is I used to use him as my fleet commander
I disagree with the people who say it's better when ackbar dies. While yes it's true when ackbar dies CLS gets more attacks and does more damage. However Ackbar has 2 specials which CLS is guaranteed to assist on and thise specials reduce the cool down of illuminated destiny faster. The extra damage from more illuminated destinies outweighs the extra CLS attacks