Keep in mind we’re most active in the weekends. I don’t know how your working times work out, but you might want to start doing it in the late evening (US time). The US is less active at night, and Europeans are less active in the morning.
See, zane, forum conversion seems to go well, but the whole site depends on phpBB2 code. By upgrading to phpBB3, it basically means a complete re-write of the site, from the way Schlaeps describes it. That’s why he opted not to go upgrade.