So I have done this same thing myself.
Here's the problem with a 1% Anarchy, so many people raiding and killing will inevitably push the Anarchy faction into Bust. Bust then spawns reactivation missions given by the Anarchy faction, which players flock to for easy regulators or the engineer unlock, and any completed reactivation missions give the Anarchy faction more influence. This can easily trigger a war, as Anarchy factions do not have Elections, and players will generally side against Anarchy factions, thus tearing the consolidation plan apart as people randomly run CZs against the Anarchy faction at any one of their many settlements. This doesn't happen in a (managed) high inf Anarchy control scenario because all the positive work needed to keep them in control also keeps their economy secure. CD-51 2650 is also a small population system, making it even more vulnerable to player action. The average player just does not know or care about BGS, or how their actions affect it, and the effects of this quickly multiply out of control as more people show up.
This system is doomed unless there is extreme dedication to maintaining it, meaning fighting multiple ground CZs for every single settlement intended to keep in favor of the Anarchy faction every time war breaks out, as there is no way to know where random people may have fought CZs, or how many they did. Recall that one must either meet or beat the number of CZs run at any individual settlement to keep it from being conquered, and each settlement is independent of the others (unless listed as the asset in question by the war). The massive amount of randoms flocking there certainly won't help. The CD-51 2650 Anarchy faction has already drifted into war by the look of it...
My advice in fixing this system going forward is to remove system control and all landable (non-settlement) assets from Purple Gang, these are positive inf sources from people trading or selling exploration data at them. Next would be to consolidate Horizons planetary assets (the ones you can't do anything at on foot) to Purple Gang. The reason for that is that players can only interact with these in negative ways that shed inf. I would also get rid of any non-landable orbital assets. Theoretically, most players would probably side against Purple Gang in most scenarios, but you can't rule out someone fighting for them and thus gaining inf. After that, consolidate inf as best as possible in 1 or 2 Corporate factions by giving them all the landable or orbital items taken from Purple Gang and continually working positive actions to them to hoard inf. Keep the remaining factions below 7%, or spare a few settlements for them to constantly fight over, and it might just hold together.