Who to 7 star next?

Tiggerz

So...I'm kinda stuck as to who to move up next. My original Arena team was Sid/Lumi/Dooku/Daka/Fett with Barris for GW and every other PvE situation she will fit in.

I went ahead and got Phasma and am currently leveling her up I have been working on IG-88 but the Han Slowlo teams are making me think twice abut that decision. I was hoping someone could give some advice. Iggy is too squishy for competitive play without some serious Taunts to keep him alive. I've learned Chewie doesn't taunt long enough and is too slow to activate for him to synergize. He was fine in early play but he isn't keeping up in level 60 arenas. Probably why I keep killing Chewie teams. Chewie is, well, chewy.

Should I switch to leveling up Han? I've had a few ideas about a build focused on Teebo/Ewok Elder too.

Thoughts?

EDIT: FYI: Sid and Lumi are lvl 5/6 abilities; Daka/Fett/Boba/Dooku (and Barriss) are lvl 4-5, chewie and the rest are around 4 to 3.