I would suggest that you put tfp, ben and han in now inplace of lumi, jc, and kylo. All 3 will work at 4-5* very well.
Unless you're building an AoE team, I also suggest you turn Kylo into a secondary special project, and not a first priority over the team.
QGJ can be a challenge if he is with jedi. He provides them with a speed advantage, allowing jedi to take the initiative. He also hits really hard, and will call in an ally. With his speed, damage, and ally call all happening before your team has acted, it can be devistating on the opening round. Call ally is a great skill for defense when the AI is in control, because it ensures focus fire with 2 heroes. Now, if QGJ calls TFP, one of your guys are dead. Then when TFP takes his actual turn, you lose another. Now its a 3 vs 5.
Finally, QGJ can also buff remove. This is essential in the current meta of taunts. The only problem with QGJ here is that with his speed, he will have already used his turn by the time any taunts go out, leaving an opporrunity for him to be killed before he has the opportunity to clear taunt.