Phasma + FOO + kylo + ? + ?

I'm assuming you haven't farmed FOTP or FOST, they're both difficult farms and haven't been useful unless you're a die-hard FO fan. If you don't have FOTP, Princess Leia is a great substitution, plays the same role but lacks the FO synergy. Plus she gives Crit Chance Up, which is effective for Kylo if he uses up his advantage. You should try PL and RG and let us know how that works out.

Biggs + Wedge will bring you some good firepower, but are likely first targets in that squadron. Dooku brings nothing to the table. And Boba fits well in most squads, but without a serious debuffer paired alongside you really miss out on his potential.