You, sir, are insane! Now go run a PBW game using 255 of these systems and bring the server to its knees!
You might want to scale ship movement down (for strategic anyways) a bit. Otherwise ships will cover dozens of systems in one turn. Just add some combat movement bonus to keep combat speeds stock-like.
EDIT:
Maybe a more reasonable setup would be 4 star systems per "system?" It would at least allow the systems to not have everything so bunched up.