For p1 just gear up cls. Send him in by himself, attack, escape, repeat. You can do around 700k at a time or so playing it somewhat safe. I usually start the retreat around 8 or so before enrage just in case it fails and it will. If you get close to enrage and he hasn't escaped then forfeit and try again. You can solo p1 that way without losing a character. Two or three people doing this can clear the phase pretty quickly. Then use enough teams to get p2 down to 20% or so and then asajj, cls, bb8, and thrawn under an ackbar lead can solo the rest. Resistance does well in p2 as you said just make sure to have bb8 escape to use him later. Our guild has a one team per person to make it last longer so i usually wait for p3 to solo 2 phases for my run.