SOE has stated that if you do tradeskill writs and the 4 main factions in equal measure, your net will be positive in each faction (but an extremely small amount). Unfortunately I know of no way to confirm this, so you either have beleive SOE or not.
In anycase, the best way to get a title IMO is to stick with 1 faction or 2 at most. Currently I do Ironforge Exchange and Tunarian (sp) Alliance, but will probably be sticking IE soon.