Juke will only trigger if that evade token isn't stripped by Unkar's escorts - who in my case will be Fenn and Asajj. I didn't even factor focus into Unkar's defenses, which boosts it significantly. On the other hand, I didn't factor in Juke or Vessery either:
1. Vessery shoots a focused Unkar, assuming Ryad took a target lock to spot for him:
He rolls a total of 2.625 damage on average. Unkar rolls 1.25 evades with a focus token spent, negating juke. A total of 1.375 damage is dealt to Unkar.
2. Ryad then shoots (but she, naturally, has PTL, not juke.):
Rolling 2.625 damage again, of which 0.75 damage is blocked. 1.875 damage is dealt to Unkar.
Even with two fully modified attacks, the first of which is juke modified, the total amount of damage is 3.25. If you added in a Palpatine critical hit, Unkar is going to take an average of around 4 damage on that first turn (at range 2). I'd be a fool to let you close to range 1 on the first turn (which is easily prevented, just through slow-play), so 4-dice attacks are unlikely. If you're flying the Palp-shuttle aggressively and have a shot on Unkar, that'd probably do it. However, a mere 2 defenders firng will not kill Unkar in 1 turn of range 2 fire, under average dice circumstances. Your experience is valid, but not the norm.