Regardless of your skill, you will be finally detected. Try to work out enemy movement schemes and get after containers when there's none around. Zoom out your screen to see what's going around. Try to be stealthy right from the beginning. It doesn't matter which container you scan first - proper one will always be last. You have to scan several containers scattered around the map - Millenium Falcon is your only ship here, while enemy has got strong fleet.