I'm 4 boxing this with a juggernaut and 3 sorcerers lvl ~22 now. I can easily get passed your first point because I have 3 CC to manage the droids. Instead of starting with CC why not have the jugg jump in and get started to let get some aggro and then CC the other droid 1-2 seconds later? At least the majority of the mobs will be focused on the jugg instead of the sorc.

I still can't do the last boss for all the required movement.

I gave up and started on Athiss which I've now successfully cleared (barely) once. Last boss took a while to figure out.