What the heck is iTunes uploading?

Question

After a frustrating week trying to use iTunes match, I've finally gotten a good chunk of my library in the cloud. The problem is the remaining 10 gigs: all live DJ sets that are roughly 2 hours long. They hover around 180 mb each, so under the limit.
Problem is, I cannot get these to upload at all. I got lucky with one, and another matched, but the rest have been a boondoggle. I've tried many things, and as an experiment I decided to remove all of them from my library, add JUST ONE back into my iTunes, and then keep Activity Monitor open to see what exactly is happening.
And this is what I get: I added back in a file that is 189 mb large. I started the transfer about two hours ago. With Activity Monitor open and set to the Netowrk tab, I originally had "Data sent: 18.38 gb". I verified that I didn't have any thing else really doing any uploads (every once and a while I'd see "Data sent/sec" spike to 1k/second or so, so I figured it was probably just Mail checking my inbox). Now it's two hours later, Data sent/sec has ranged from 40k/sec to 90k/sec (darn ADSL's slow upload speeds). But here's the kicker, I see "Data sent: 18.69 gb"
Now, correct me if I'm wrong, but a 189 mb file added to 18.38 gb should equal around 18.58 gb. Which means that iTunes has magically uploaded an additional 100 mb or so of data. Even considering the fact that, since this is an mp3, it'd get re-encoded into an AAC, I find it very unlikely that we're talking about a 50% decrease in compression efficiency, and keep in mind that the upload STILL ISN'T FINISHED. In fact, as I write this, it's now at 18.73 gb data sent and no sign of stopping.
Does anyone know what exactly is happening here? This mirrors my experiences with my first few attempts at uploading these sets: 10 gigs at once, but 6 gigs of uploading later, not a single one had finished. WHAT THE HECK IS ITUNES MATCH DOING??? I'm seriously considering canceling and seeing if I can get my money back, since I mainly cared about being able to stream these sets onto my iPad.

Answer 1

Uh just to update, at around 18.77 gb data sent, data has stopped being uploaded from iTunes. Except it's still not done "uploading" the one song. So now I guess it's officially hung.  WHAT'S HAPPENING???