We've imaged thousands of computers, and don't see this issue when both ports are connected. We currently use WPA2 enterprise as well, and have upgraded from 6.3.0.2 to 6.3.1.0.
We have hundreds of users that plug in, and have their wireless on. It's also standard practice to rename the computer a unique name in System Prefs - Sharing immediately after the computer is imaged.
Not sure that this is much help, but our environments sounded similar.