I've set up a few network controls for Uni's and in particular, bandwidth controls. Often, certain nets *cough, dorms, cough* are targeted with restrictive bandwidth policies that purposefully introduce latency and total bandwidth available over a length of time to quietly discourage online game playing, file down/up loading, etc. It never affects normal email retrieval or net surfing, so it's easy to implement without creating rules or policy that have to be debated and published.
Packeteer is such a product that is selling VERY well into Uni's doing just this.
Running those traceroutes I think you'll find that your problem is less than 3 router hops away. And no, there is nothing you can do about it other than find an alternative network access source and that's out of scope for this discussion.