Thrawn was not difficult at all. The only reason it was, and is seen as difficult, is because one guy set a benchmark at G8, and that was then the assumed gear requirement to get it. 'Don't gear Phoenix, they can do it at G8, anymore is a waste'.... FTR I did the Thrawn event at G10, which is still a long way from max, and it was unbelievably easy.
People keep using the bare minimum to finish events, and then complain it's too hard.
I've said multiple times that the Thrawn event was tuned for G10 at the high end, and you're right in that people try it a lot at G8 a large number of times (our own data confirms this) essentially banging their head against a wall until they get very, very lucky. In an effort to try and mitigate that, I put the gear tuning recommendations into the descriptions of the tiers in the forthcoming Chewbacca event. Hopefully that helps.