Have to say I also think Ackbar's a bit too good, he will be everywhere.
He might be costed about right, but +2 reds is a lot of extra bang.
We've been playing 400 since the game shipped. My first 300 games ever were Sullust.
I think you'll see everything and anything from 2 ships up to swarms.
Even though it's a much more deadly arena for the smaller ships, they have the maneuver and the initiative sinks to be competitive.