Bitcomet limiting download speed on its own?

My internet connection is 1.5mbps to 3.0mbps. However BitComet is limiting my download speed to about 210kbps. I know that it is not a lack of seeders, because stopping one torrent or another results in another one speeding up, but never past 210kbps. I have selected no limits for uploads and downloads, however uploads seem to not go past 50kbps. My computer is hooked straight to the modem, not to a router. How can I fix this and get full speed downloads and uploads?