I appreciate your efforts, thank you.
I disagree these posts don’t help, though, as the ones I am referring to are fairly subtle efforts, so you may not even be able to reasonably address them, unfortunately. I have found from modding other forums (City related and otherwise) that the “alert” posts do help call out the behaviour to regular (real) users—as in the heat of the moment people tend to just react or internalise, rather than identify and ignore—which tends to be the best defense to the subtle echo-trolling, apart from best effort clean-up, which you are already doing. The trolls want amplify negativity already present to a critical level, so identifying the tactics eventually leads to less activity (though, they’ll still try to keep on in the short-term).
I’ve always appreciated other users generally pointing out that sort of the activity, without malice, (rather than replying directly, as you have said) as it usually leads to greater awareness and deescalation in general. That’s in addition to reporting, which does a more immediate job, to be sure.
At any rate, they are out in force and will likely be for the foreseeable future. Godspeed and thanks again.