Thoughts on my setup?

Greedo_shot_1st

Currently for most battles it's

7* Sidious

6* Luminara

6* Geonosian Soldier

5* Royal Guard

5* Boba Fett

I know I should probably remove Boba... But who do I replace him with?

I'm farming Ackbar and Poggle, they are my next best characters

Arube

I'm going to assume you are in the mid 60's, possibly 70's. At that level of gameplay I would definitely work on removing Sid, and Boba Fett, and eventually phasing Luminara out. As a start, Phasma should replace Sid, and QGJ should replace boba fett.