Red Limit Boss help

So ive been doing Fractal Vice runs since Backgammon's week, and i still havent defeated any Red Limit boss. Probably mainly a skill issue on my side but any help on building teams and any tips you can give to me on fighting Solitaire. I maxed out all of my characters trying to defeat it but i can only reach up to 4x health left on the boss . The farthest ive reach is with Semba, Kuronaka, and Saigo, Semba and Kuronaka keeps on dying on the boss's one hit explosion attack.

This is my current roster

This is what im using on solitaire