I tried this fight roughly 5-6 times, and here's my experiences with it-
Combat Sentinel, level 50, most gear around 106, with 1 Correllia commendation hilt. I didn't have any relics, pure laziness on my part.
At first, the puzzle chest was bugged, so all my attempts except my last were with T7 in very subpar gear. I put in a ticket and logged off for about 20-30 minutes, came back and the chest was lootable.
Now, all my previous attempts I got romped hard. I came here and read a lot of posts about it all, try again... and get owned. Again. I was finding it hard to believe all the people who would say 'I did it fairly easily, you just gotta get it right'. So I logged off, took a walk, came back... And, not ONLY was the chest suddenly lootable for me, but I handled the fight like a pro. I actually found myself thinking 'Man, why was that so hard before?'
So my advice- It's doable. Line of sight the Emp's lightning casts, whack-a-mole the clones, and just stick with it. Interrupt the Force Blast cast, Awe and Force Stasis work, and Force Leap. It's a long enough cast, you CAN get enough range to Leap if you move fast. If it frustrates you, step away for a minute. But it CAN be done.