Did you follow juo78's steps on how to calibrate the battery? If you did there are very few things you can do for the screen. Try auto brightness or some really low setting. If you use your phone heavily like me display and dialer are always on the top. Juice defender is good idea to save battery while your screen is off - it uses a smart algorithm to turn data off and on so that most of the time there is no data on your phone and therefore there is very low battery loss during standby.
Is it bad that I like code???