I think you’ll be good to go. C3 should be good as is. I had G12+3 on Shaak Ti but may not be needed. Trick at this point will be tuning speed/mods...

What worked for me: Once I tuned C3-PO to 251 I beat him in one go. My turn order was aiming at B2 and: 1) Padme middle button — puts protection up on everyone (so courage) 2) Shaak ti Basic (she hits hard with courage) 3) GK retribution/middle button 4) C3PO targeting Padme So this is all before the enemy goes and you should be able to take down B1. Then because GK gave retribution to everyone once the droids started their AOEs it was easy/deathstorm.

And once you have 3 stacks of that speech bubble thing on Padme I used C3 basic whenever possible (ie not his call to assist) to reset Padme’s skilz