Pro 4.8.0/X.3.8-Still Slow DL Despite All Suggestions!

[dijon]

First post - a bit nervous as there's lots of smart people here, and I'm definitely not a Mac or Limewire techie.

My main problem is slow dl's (1-2 KBps) despite implementing all (I think) of murasame's and leeware's (and others) suggestions on various threads.

First, my home setup:
Pro 4.8.0/iBook G4/X.3.8/512 sdram/wirelesss setup (Airport Express Station)/hi speed cable isp - d/l speed:4704 kbps (? 588 KBps), u/l speed:1016 kbps (? 127 KBps)/ cable modem SB 5100 Surfboard.

On system prefs/sharing, I've checked that the firewall is off, as well, it tells me that the TCP network traffic on port 6346 is being let through anyway.

I've used airport admin utility/port mapping to, I think, port forward port 6346 to my private IP address. I set both the public/private setting at 6346.

I've gone through the limewire settings as described by muresame/leeware and others:
max dl' 20
dl speed unlimited
ul speed unlimited
router config: UPnP (should it be manual port forwarding?)

I've done all this and still I get 1-2 KB/s. Aarg!

To me, the firewall's off/open, ports are forward, limewire is set. What have I missed?

I am a little confused with respect to 'pushing' my actual computer IP through limewire. There may lie the problem. As well, could it possibly be the cable modem? The ISP tech guys say it's working fine.

Unfortunately, it looks as though some kind soul needs to hold my hand here and walk me through this.

Sorry about the long post. To someone who isn't sure about these things, I'm not too sure what info to include/exclude, so it all gets thrown in.

Thanks very much. I've spent today learning all about this stuff thanks to all the threads I've gone through.

dijon