I am getting a little angry about the ignorance here. The system is perfect how it is. You have all available tools to your disposal for playing the BGS. Just use them in the right way.
If you can't deal with a single Cmdr, and therefor want to track him down, you should not be doing BGS at all. If a single Cmdr can influence your System, you are just doing it wrong. BGS is time consuming. So the time to get in touch with a single human is better spend on some inf missions to counter that. The danger comes from organized efforts of langer groups. Again, when you are not able to recognize them, don't do BGS. Some Cmdrs are even posting openly their mission log on INARA! Really, Gentleman, there is nothing more simple to know who is operating against you. Just invest time and do some research. I can't believe it... i am doing BGS for 6 months now what i assume is a very short time.
Get creative! Its all out there for you to use. Think outside the box and do some "cutthroat galaxy" stuff. Use lies, infiltration, mercenarys, false promises, credits, observation to your advantage.
Your system faction looses inf and you can not explain it?

Be aware of your surroundings. Who has an interest in your system? The PMF 50 Ly away? Noooo. It must be one of the three PMF backed by squadrons in your neighbourhood. Wich of them was aggressively expanding in the past? Do you have your informants placed to spy on them? Is a neighbooring system taken over in an blitz operation shortly? What does their squad ethos say?
THIS gentlemen is playing the game! Not looking at stats that some nice game developer publishes for you because you are to lazy to figure it out yourself. Unbelieveable.