You may also have to get an identd spoofer. A good portion of the IRC servers try to check that you are who you say you are by connecting to your identd service. identd is "identity daemon". When you try to connect to IRC, the server trys to do a "call back" to see if you are who you claim to be. If it finds that you have been banned based off of your ident information, it won't let you on. If you are running Win, I'm not sure how to get around this, but if you are running *nix, then you can turn off your identd server and run one of your own that will send whatever response you want the IRC server to see. I have one that I wrote in TCL that works great. If you want to know how to write your own, check out:
pogostick.net/~tom/rfc.cgi
and do a search for ident or identd.
read the RFC on it. It's not that complicated.
Good luck and Happy Hacking