found the problem.. heh, no have you checked your firewall settings? read the faq on settings? Yes the number of downloads will effect your speed if your on a capped connection.
As for seeds, the more the better not because if theres 161 seeds that you download off every single one but the fact that if theres more then there will be more of a chance someone is on a nearby connection with a small amount of hops.. hence better speed for you.
Im on an optus cable connection and Depending on the file Itll range from 30-80kb/sec on avg.. then sometimes spike to 150's 170's or sometimes itll decide to drop below 10 for awhile.
It will never use every seed that is listed. So to recap, it depends on the file. But for a norm be expecting 30kb/sec+