Ok sorry for the delay, now I have an update. Thanks for the tips, but I shot myself in the foot. I had performed a few assasination missions with Vader (being an idiot) and Luke was a Jedi Knight, so when I abducted him, he broke free, took Vader, the Emperor and fled to Commenor from Bortas. Fortunately, I had 3 planets in the Corellian sector, and had stationed one of my big fleets there. It was a 22 day trip for Luke Vader and the Emperor, so by the time they got there a fleet of 12 ships was waiting for them.