SFPLAT,
To follow up on the last poster's point, fares are loaded into Worldspan at about 12:30 am EST (9:30pm PST). It is on this load where the best fares are typically found. Worldspan's next fare load is at around 11:30am EST (8:30am PST). Often many of the 'crazy' fares are gone at that time. There's a good chance you're missing these fares due to time zone constraints.