High traffic systems are always going to harder to control - which is why as a lone player I hang out on the edge of the Bubble.
But for an active opposition, they should absolutely be able to counter the effect of regular BGS work. There shouldn't be method for reducing faction influence that can't be countered by an equal amount of work by the opposition - or, in this case, the method is there, but there are consequences to using it.
It’s not equal though. Moving a faction from 1% to 5% is pretty trivial with missions of all types, bounties and even trade/exploration data if they own a port. Supporting 6 or 7 other factions so that they all gain more than the one you want to retreat to avoid them losing influence to the retreating faction is 6 or 7 times the work even without taking into account the diminishing returns for getting near 1%. More like 10 to 20 times in my experience.
Without a black market (which many automatically don’t have) you can put in 10 times the effort of a passing player just grinding credits and lose. That’s the reality I’m afraid.
As noted I don’t use murder for RP reasons so it’s what I have to deal with. I can understand why people do use it accordingly, particularly as my current target for retreat means no BMs to help.
I’m pretty much left with the potential to lower my faction into war, push them to a meaningless expansion I don’t want, or lose another retreat option. I’ve ended up just losing the retreat accordingly.
So while I won’t do murder, I must admit that going into attempt 6 it’s getting tempting as the only option I do have other than crossing my fingers that 6 will work.
Oh and that’s a system with 2 other players through in the last 24 and nobody in open while I’ve been there, so hardly high traffic but those I’m trying to retreat got a 6% bump on that day.