Dang, yeah I wasn't as lucky.
Does my logic make sense that when you press the center diff, if the clunk goes away, it must be something internal? If the clunk goes away with the diff locked I can't see how stuff like bushings or control arms could have any different reactions.
Myself and many others have chased it with minimal success. Sure you should be greasing your driveline and making sure your CVS and hub flanges aren't worn. But otherwise don't start throwing parts at it. I've replaced bushings and just about everything I can get my hands on, it didn't help...