it is not about the connection speed .. some times it is not ur end .. it is the bot's end
i remember when i had a connection with the same download (14k/s) and i used to download smoothly and it always maxed my connection
and the problem isnt in the client .. it might be the client's settings ..

and im sorry i dont know what is BitchX
if ur facing a problem u can start ur own post and we will try to help u