Im really happy that You still are trying to help... but think, if i can seed without any problems for other trackers I use, than how can this be my client or ISP. To prove this I can tell You that just today I uploaded 1,5Gb with single active torrent on rutracker. Really, its impossible, my ISP and Utorrent are 100% OK, what's so special about bakabt, that would cause such weird problem.
And, again, this case don't look like it can be solved, let's just stop here. I give up.
Maybe Sherlock Holmes would find the cause, but we are not Sherlock.