best advice i can give you is take your time look around read what has bugged others and the fixes they've used, it seem we haven't all been experiencing the same issues so see what applies to you before you go changing something. no one has yet found that magic fix the covers all problems as far as i know.

 

I am pretty sure that what you killed comes back only if another app or setting in the phone needs use of it. Name some of the apps that do this to you.

 

I have my phone rooted, and I use an app called "Root Toolbox" which will let you freeze an app, (basically it stops it from doing anything at all.) and there also is a start up manager in that same program. This is my advice to you if you are worried about your programs that much, get all the info on rooting your phone and then do it or get some help from a friend who knows tech stuff. if you don't want to root your phone then try to find an app that will manage your programs at start-up. As of right this min I am not sure of any, but I will check it out and post it back here when I get some info on this...

 

It's all about the app killer, and how you are using your phone. The last two days I have really only used my phone for texts and short calls, but I forgot to charge it last night and it made it through the day today without any problems. I'm not a power user, but I'm sure that me getting my warp to run 36 hours without a charge not a miracle. Also understand that your large screen will drain the battery really quick. Same with navigation, data, and a slew of other cool things that this phone does.

Personally I use the free version of "Advanced Task Killer" and set it to kill all task every time I turn the screen off.
https://market.android.com/details?id=com.rechild.advancedtaskkiller&hl=en