So our great plan so far is to not lynch anyone until the investigators know who the mafia are? Sounds sensible, but so boring. Since the journo's can't reveal themselves until they know all three names (four if the mafia convert), it'll be at least three nights until they can say anything. Two if they say two names and let the other journo find the other. 3 mafia in 13 players means a 23% chance of randomly choosing a mafia to investigate, so you'll get a mafia around every four nights. If we assume you hit the mafia in the middle of those four nights, then that's an expected 10 to 11 nights, or another couple of weeks, until the journos reveal themselves. Thank goodness we're not doing 48 hour rounds!
And there's no reason to talk to each other, because there's nothing to gain by it.
I'd prefer the voting strategy personally, if only because it at least sounds vaguely interesting (and seems more in keeping with the spirit of the game).