They don't care about one offs really. They know who is worth watching and are looking for the guys making the stuff. There's s huge db of cp that interpol and the fbi runs all images against to check for common faces, places, etc and to track the spread of this shit. also, your cp takedowns are small potatoes. I'm sure no ones even gotten to looking at the archives of your sites and even logged anything yet.
I think they are required to and if found then onto a watch list and I think repeatedly doing that is only going to raise that particular pile of shit idiot's profile on that.