Speed 200 isn't required. I cleared it today with:
EP (L) - Speed 145; G8
Vader - Spd 167; G9
Stormie - Spd 111; G8
Snow Trooper - Spd 98, G7
Royal Guard - Spd 113, G7.
I have a big focus on protection and health, so I was able to soak the first round...2-3 attacks by most enemies, without losing a single character.
Like the others, I focused primarily on R2; Before using Vaders AOE I used EP's heal; The bonus damage boosted the effect nicely, and the increased damage increased the healing, thereby survivability. I kept Han stunned/slowed and focused stunning/ability block attacks when needed, then on Leia when he was stunned/blocked. Between this and Vader, I wore down Luke, Leia, and Han and killed all three in quick succession; I tried saving Kenobi for last (didn't succeed...) because of his death effect.
I won't say it was an easy fight(s). It took a lot. But as you can see, my speed is rather low, so I had to soak a lot of damage, and relied some on RNG to win it. But the speed wasn't a nececssity, just a HUGE bonus.
In the end, keep as much damage away from vader and palp as you can; everyone else is mostly expendable in my build, those two are critical; without one or the other, this team loses, hands down.
Here's the link to my squad:
http://swgoh.gg/u/klause/squads/7/
