Change one WoE day to Sunday or Saturday mornings would be very very nice. That would encourage me to consider WoEing again as I don't really like the afternoon times, I cannot fit it in my weekend as I do drive home occasionally and I usually drive back in afternoons. I recommend Saturday morning because Sunday is a church day, and I wouldn't wanna force people to pick between church and a dumb videogame.
Um, perhaps guild packages for new guilds joining server could help, but depends on how many people actually are serious about keeping said guild. :s