Basic mass heavies attack at HQ7. Even against lv8 Turrets, the Droids can keep heavies alive for long enough to march through.
I used to use Wookies/Juggernaut (see old post for HQ6 viewtopic.php?f=9&t=1212
), but the ATAT AI buff didn't work for Juggernauts. They will still try to drive up next to the shields before firing. Without any units on Rebel side that can quickly take out all the shields, heavies are the only way to take out the shields and still have enough DPS left to clean out the base in 2 mins.http://youtu.be/4yBjOKm5ycA