Hey dude, I found out why your max uploading kills the line - quite simple really:
Some upload bandwidth: You download something, it sends a reply that the data was OK, it sends more data
No upload bandwidth: You download something, no bandwidth to send reply in designated time, stops sending data
http://goarticles.com/article/ADSL-Why-does-uploading-kill-my-download-bandwidth/1580878/
Always knew there was a reason, just didnt know exactly how to explain it
I'll have a read... thanks.
xrapidx - are you using SSL? do you find with older nzbs you don't get full line speed?
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Yip - SSL - haven't noticed slow speeds on older ones, downloaded a 15GB download just to test everything was working again - it was over 500 days and came down almost all in one night.