anything that you have relics on you might as well take to relic 4, if you can, I'd prioritize GK, Magnaguard, B1, and Ahsoka, basically in that order. The longer you keep your tanks up the more RNG wiggle room you'll have and the more damage you get those damage dealers doing also buys you more RNG wiggle room. R1-R4 materials are pretty cheap to create so it's mostly just the first 2 signal data types farming with cantina energy. If you can gear up 3PO more that may also help there is aoe damage in that phase so he will likely die at G9. Shaak Ti at G11 will also likely die. Asajj is also, likely to be a sacrificial lamb, but if you get your other droids that you already have at relic 1 to relic 4.. you will have a good chance, and just try to keep Droideka rolling for damage immunity.