As regards your second comment, what you are doing is fine, but it really dosent matter much. Plug it in when you feel moved, and pull it out when you want rouse it. Other than a monthly full discharge to keep the meter calibrated, charge at your convenience.
As regards the first post.
You are doing good by shutting apps fully down, and keeping your screen brightness under control. All that is left are a few other things you can think about. And I think in your case it will be one or two things that you can control.
Are you syncing with the cloud? If it thinks it needs to sync, and can't get a good signal, it will keep trying and trying. There are also some cases of an 'irreconcilable address' where the cloud finds a conflict between two addresses, and just keeps going back and forth, running the wheels off the radio and the battery. If you are a cloud person, turn it off for a day or two and see if that is the problem.
Do you have any subscriptions, or feeds? Even if the app is off, or the pad is asleep, it maybe looking for an update, and keeps looking and looking.
Lastly, if your mail is on push, thrun that off. Particulalry in you are in a marginal signal area. The pad will run itself to death checking your email and looking for a signal. Fetch, every hour or so will keep you informed, and take some heat of the battery.
So play around with your settings. Noticiations, updates, location services all use juice. Turn off as much as you can, then, gradually turn them back on until you find the culprit.