I installed MyLife by Zokem and saw it didn't work very well so uninstalled it. Since then, my usage and standby time have been exactly the same, so I'm led to believe that something didn't uninstall properly. The downside to this is that my battery is draining 1% every 5 minutes rather than every 10 when in use. I cannot fathom the standby/usage problem though! I'm jailbroken on 4.3.1 and have never experienced such a problem before. Any advice is welcome!