I think FO will be workable once KRU is farmable, but unlikely to be meta unless Hux or Snoke are released and bring something new to the mix.
Anyway, looks like you have a good start on nightsisters, who seem to be a credible arena faction. But beyond arena, I think you need to farm up some scoundrels so you can start cashing in on credit heists, which account for a big chunk of the credits one gets in the game. STHan and Lando are good choices because they are also Rebels and STHan is needed for the CLS event.
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Anyway, looks like you have a good start on nightsisters, who seem to be a credible arena faction. But beyond arena, I think you need to farm up some scoundrels so you can start cashing in on credit heists, which account for a big chunk of the credits one gets in the game. STHan and Lando are good choices because they are also Rebels and STHan is needed for the CLS event.