I just got to Tier III of the JML, unfortunately after JKL was nerfed. I CANNOT beat Vader. JKL is R6. Offense/Health Mods all VI-A or VI-B. Damage is at 11,193. Is this because of the nerf? Do...
Use a slow, offense-modded JKL, including offense primary arrow or crit. avoidance if you prefer a little saber toss insurance.
The key is keeping Jedi's Will up for counterattacks and finishing the fight before Vader gets DoTs stacked on you.
Open with Heroes Arise, Repulse, Stalwart Advance and use Stalwart Advance again as soon as it recycles and Heroes Arise again if the battle gets that far.
Then move on to Palp and nuke him, ignoring Vader. No real risk on this part.