Well, I've earned gold two more times (once with 81% accuracy) over the weekend, so I'm moving on to Escape from Fest. I had to really conserve my shots and be as precise as possible. For the TIEs, I made sure I was right on their tail before firing my lasers so that I was almost certain to land a hit. And, if possible, I tried to save one seeker missile for that Interceptor who tries to nail you at the cloud city. Also, at the final platform (the one with the missile launchers), I ignored the missile launchers and laser turrets and went straight for the containers to end the missions as fast as possible.
(BTW, I have the PC version, so it doesn't suffer from the "ghost turret" problem that the N64 version has on this level.)