I don't remember exactly, but I think there was also a scene in Deleted Magic where we get to see some of the original audition footage, and in the original writing for the scene, Leia mentions essentially that even if they're being tracked, they need to start their attack sometime, and the Empire coming for them simply initiates an already inevitable confrontation -- which is the purpose of getting the plans to the Rebellion. I don't remember the scene exactly, so I hope I have my facts straight. I also don't remember if she mentions this, but it would kind of make sense for them to use themselves as bait to bring the Empire to the base -- now that she can ensure the safe delivery of the plans, the Empire coming to the base eliminates the need for the Rebels to get their fleet to the Death Star on their own. So it's not really a plot hole, and actually makes sense strategically, from a certain point of view.

Take care,
Sojourn