I am auto-clearing GW with my phoenix team. But I have been clearing it ever since I started playing (hit lvl 40) with the exception of ONE GW. It still haunts me because I could have easily have done it if I wasn't too tired and hasty. Here are some tips n tricks for playing GW:
1. Prolong the fights as much as you can (when in your favor). Pick them off untill you have 1-2 opponents left (preferably a chewie tank that doesn't do much by himself) And then pick it off with basic attacks to get your cooldowns ready.
2. Kill enemy healers first. Even if their heal is not a deciding factor, it will give their characters more time to damage you. Your goal is to get into every fight as healthy as possible. That is why phoenix is so good for GW, their damage is not that great but their survivability is unquestionable. GW, just like this game, is a marathon, not a sprint.
3. When I started doing off I always went with Consular and Talia. YOu have Luminara Unduli which is a lot better than Talis so have her, consular, and 3 other toons for your main team.
Old ben, Rey, Princess Leia, JC and Luminara will get you 100% GW cleared if you pay atention.
4. This is not a bug, but it will help you a lot to finish GW. I noticed at one point that when you retreat from a GW battle, the next time you start it the actions will turn out EXACTLY THE SAME, as long as you follow the script. If you dont understand what I am about to write, watch "edge of tomorow" movie, this is 99% the same thing.
This means that if your Rey crit her first attack on chewie, it will ALWAYS crit for the same dmg as long as you atk chewie with it. And so the 4th move, your princess Leia also crit boba, as long as you retreat, and do the first 3 moves exactly the same, she will always crit boba on the 4th move. You can use this to fine-tune every battle for the best possible outcome. FOllow the script for as long as it suits you, and if on your 9th attack your old ben misses his auto on someone, retreat, do the 8 steps and atk somebody else with old Ben, or use an ability. Keep in mind that as soon as you break the script, everything changes. Even if your 10th attack was a crit, it is not guaranteed to be so again if you did not do the 9th step.
Good luck. I expect you to let us know about your GW triumph tomorow.