(Rant)Leia Tier 2 is a good joke

I remember that level being difficult, but after getting the hang of it I coasted through without failing another attempt and then went on to help others do the event with no losses or one loss total. What we were doing on 50 Shards was working, so it is beatable. 

The trick really is the Tenacity set for Cap'n Han, but you said you were able to get Ten of 160%+ and that's all you need. I hope you're not modding Leia for Tenacity, and I also hope you're not cleansing her DoTs with CH. Just let her die (if necessary) and resurrect her. You're going to want to use Ability Block and Confuse on Vader as much as possible -- though maybe there was a tank you had to confuse to prevent taunt? Not sure. 

More than that I can't remember. I'd have to go back and reread what we wrote up at the time. The short version is crzydroid's: this is doable. Yes, it's frustrating, but it's doable and unlike the Hondo level in the Aphra unlock you can control the variables you need to control. If what I've written already doesn't help you, seek out guides -- text on Discord or videos on YouTube -- and get it done that way.