Fives - CT 5555, Proper Strategy with Phasma ?

The slow on 5s basic is sneaky good. I often will use it over the assist call until I have control of the match and save the assist call to finish quickly. I'm partial to 5s since he was my first 4 star and I almost have him to 7. I think his counter will be 100 percent by 80 too which will make him a lot better. Missing the counter 30 percent of the time is painful.