I’m guessing not being able to rapidly eliminate your enemy means your opponent has extra turns in which to debuff you. vs. zzEP teams you should have survived Vader’s AOE and wrecked them in the first 2 turns.
I do also wonder whether GK is the right tank (I see you are using him). I use Old Ben and Ability Block their whole team Turn 1. By the time that wears off it’s 5 vs 3.
1) You can still get debuffed - it’s just harder.
2) Old Ben is your friend
3) Your damage dealers need gear and the right mods - also lvl them to 15 please.
Jedi require Bastila’s protection, augmented by a taunting tank and GMYs foresight.
They need 2 high damage dealers.
They highly benefit from Old Ben and his Mind Tricks and Taunt.