I have a droid arena team as well. But I farmed some healers for gw. Get Barris or ewok elder, they really help. Save your droid squad for the last 3 nodes, they can take out any team.
Yeah, my strategy has been to run my lower tier characters early and save the best for when I really need it. I don't have Barris or EE, but usually make it through. Though yesterday I got stuck on the last node and was pretty **** about it.
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With the regular 7* Droid set up