Two can play at that game. What makes you assume that witches CAN'T PM each other and don't know who each other are, when that's standard mafia practice? The only reason you'd have to NOT assume that is if you've been told otherwise.
If you were anyone else, I'd find you a bit suspicious by now, but I know this is how you operate, so it's cool. Lay this level of heat on everyone, so we can see who cracks.