I now have:
Dooku 3* lead G6
Lumi 6* G6
Leia 4* G6
GS 6* G7
And QGJ 4* G6
Also farming:
Rey 25/80
And RG: 2*, G4, 2/25
Who Should I use or replace.
Doing:
Hard nodes: Dooku, Rey, RG
Cantina nodes: GS
Cantina shipments: QGJ
GW: Lumi
Arena: Leia
And Raid shipments: Rey
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Replies
However, you might need a taunting tank. You can try out your RG to find out how well he dies currently. However, I believe, you will benefit from farming ST Han instead of Leia for now, and then leave Leia until after ST Han.
After finishing you Luiminaria farm, I suggest farming Phasma, who will make an excellent leader.
Other hard nodes to farm:
Chewie, Teebo and possibly ewok elder(for raids p.1 and scoundrel event — long term planning).
JC (for Yoda event — long term planning)
I'd definitely second working on Phasma after Lumi (and then maybe your third choice could be Teebo or even IG-86?). Teebo (especially with Ewok Elder) will help immensely with raids.
I'm unsure about stopping Leia for Stormtrooper Han. It's true that you'll want a taunting tank at some point, but STH, if I understand correctly, needs a LOT of investment and high gear levels to get very good. Otherwise he's just too squishy.
On the other hand, 2* RG is pretty squishy too right now. But eventually he'll be amazing for you—just keep farming that hard node (and if you can push through to Dark Side 5-F hard, you'll get a second RG node, if you haven't already).
So given that RG is weak for you right now, I'd stick with Lumi in arena until RG gets another star or two.
What to do with Rey, lol? MAX HER. Dump resources into her, knowing that you won't regret it. As for Arena, she could replace Lumi or even Leia if RG has replaced Lumi by then. Rey, RG, GS, and QGJ are do extremely well right now.
Dooku's a decent enough lead, but I'd think about replacing him with Phasma once you get her starred decently (which will probably be faster than you can farm Dooku).
GS is a great choice to max in cantina nodes. Old Ben is also very popular right now in Arena (but he's not really my style, so I haven't gone for him myself. I still use Phasma lead).
But seriously, you've made some great choices off the bat. Keep going that direction.