How can I stop AirPort from waking my Macbook Pro?
You have gotten pretty far and tried several things. Found this gem: http://support.apple.com/kb/PH11080 which has a list of things, some of which you have already done. 

XHC1 refers to a Bluetooth device that is trying to wake your system but the fact that you are getting a output of "AirPort_Brcm43xx", the AirPort message pointed me to: https://discussions.apple.com/thread/4645214?tstart=0

And if you have everything unplugged, BT is off and you have disabled the "Wake for network access" then I have a tendency to think that your OS is corrupted. I would go so far as to say that Power Nap is the service is that causing this but hard to say without for logs and I don't have that much free time! ;)

Unfortunately in the Apple discussion there was no marked answer/solution so if the issue still remains after a reinstall or test OS then you might have a hardware issue. You could also try resetting the SMC (http://support.apple.com/kb/ht3964) maybe the AirPort/Bluetooth card and MLB need a quick power cycle via the reset.

Hope that helps in some way.