It s an injustice the high difficulty of the last level of CLS

I did it with mine at gear 9, it was tricky but RNG does play a deciding factor.

I put Han as lead and nailed it after about 8-9 tries. It helps to use R2 and Leia both in Stealth to give the team some cover and take advantage of Luke's stun shot.

None of mine were particularly high on speed, I think about the 140/150 mark but it should be possible with your crew. Good Luck.