"unlimited" is not a useful setting, IMO as it so overloads the internet connect that the resulting speed is considerably less than setting fixed limits.
Have you tried setting upload max to 50 KB/sec, 10 peers at once -- set as a 'fast' internet connection?
Use a bandwidth monitoring program (or try figuring out Win XP's) to see how smooth your uploading and downloading is. I use AnalogX NetStat Live to monitor my bandwidth.
If your bandwidth-monitoring program shows lots of bursts and then drops...especially if they go to 0...then something is overloading or just poor at managing heavy loads. I've found I could reduce speeds in BitTornado 1 KB/sec at a time and watch the results for 15 seconds...and uploading around 30-40 KB/sec went from jagged to pretty smooth for heavily populated torrents.
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