The link below will help you with Codec's
http://www.gnutellaforums.com/showth...threadid=40665
As far as increasing your UL speed if you have it set at max and you are UL at 25KB/s then 25 is probably your max UL speed. You can do a speed test at the link below.
http://www.dslreports.com/speedtest?more=1