So I downloaded 2 different app killers, problem is every time I hit kill apps and it says apps are all shut down, I go into settings and it says all of them are back up and/or restarting. How can I keep them killed?
The best answer I can give you is to not use a task killer at all.
Now..if you have an app that is refusing to close and is legitimately draining your battery and/or keeping your phone awake...you may want to consider replacing the app.
Otherwise...free RAM is wasted RAM. The One has about 500MB dedicated to making the OS run smoothly...the rest is for apps...and you will do more harm than good if you just keep killing them...the phone will operate more smoothly is you just let them live.