What is causing launchd to burn my CPU?
There is an app called LaunchControl which provides a very nice interface for creating/checking/modifying/disabling launch daemons and agents.  It's much easier than looking in 5 different folders for startup items.  (I'm not affiliated with them in any way.)

I would go through and disable each one at a time until your problem disappears.

http://www.soma-zone.com/LaunchControl/