There are applications called packet shapers that can do Layer 7 (Application) examination of packets and determine what protocol they're for, no matter what port they're running on. It's entirely possible that no matter how you change the ports, they're still getting subjected to a much lower priority due to the P2P nature.
At my uni, web traffic gets the best priority, then things like mail and FTP, then unknown traffic, then games, then finally P2P. Even if you try to change the port to one that isn't blocked, you may still run into problems.
You could try running BT on port 80 (WWW) or 25 (SMTP) and see if that helps - but if they're doing Layer 7 inspection, it won't.
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