I think you're currently on the right track. It is difficult to build a team with any sort of synergy early on when your selection of characters is so small to choose from.
For PvP you definitely want your highest star rank characters since they'll have the most stats. I highly recommend you continue to focus farming shards for Consular to get him up to at least 3* but preferably 4* as you need the a healer that can stay alive.
Continue farming Luminara from Galactic Wars shipments and Sid from Arena.
At that level, Maul is still a good option at 4* even though you can't rank up, as long as you have his skills and gear upgraded as high as your level permits.
I would probably say to switch him out for Sid right now, but make sure you have Sid's skills and gear up to date before you do.
But when you get Consular to 3 or 4* and he's less squishy maybe consider switching Chewie for Maul.
I know you like having a tank now but at the end of the day you want to be able to do more damage.