Something else to mention, Tagge is your man for R&D. If you have to cede last action either by assigning a leader to defense or opposing he can still parry Sabotage with his fist by running R&D at your most valuable system.
Basically what I'm saying is that if you want to block sabotage at Corellia, R&D isn't always needed, you just need to get fists in the system. Rule by Fear with Vader also works for example.
Edited by Uglymug