I'm just using in-game tools and eddb.io. Since I'm focused on just one system, I can 'do the math' in my head. Speaking of, as a lone CMDR I'm not looking to control an empire. I'm basically roleplaying the "A-Team", where I go into a small town (system) and help the oppressed regain control and their livelihood, though I do also have a bit of CIA covert ops going on as well (I support one of the three superpowers).I use excel to track everything in my systems..its extremely useful. Are you using anything specific to track your systems reactions to what you are doing?
Once I get this system to where I want it, I'll move on to the next 'oppressed' system and do it all over again.