OK... that's odd... Android OS is usually in the lower end of the spectrum with normal usage. Historically, one should see Screen on top, then the most heavily used apps, then Android OS, then all the other background processes associated with apps. I must tell you this from experience on other devices, the wireless (3G) will be detrimental to your battery depending on two things -- proximity to a quality signal from your primary service provider and whether you have available WiFi at the same time. I know you wrote that you have turned them off to no avail but have you turned WiFi off and monitor what your 3G signal is on average over time? And then, vice versa... Or turn off both radios and only use on-board apps to see how it holds (example would be using games, watching a stored video, reading a book, or listening to stored music)? Finally, is everything up to date. Did you run the latest updates of OS via settings?