I am on my 3rd discharge cycle, I hope I can get nearly as good as what you described. I will be ecstatic.
Do you mean using Mirolg's back up program or something different?
One thing I've notice is that IE just kills the battery and fast in Tango. I haven't seen this in Mango near as bad.
To backup my app data I install ultrashots wmdc xap so I can browse the phone folder structure from my PC. Then copy the application data to and from the phone.