firewall/router: from what you describe, you should be fine. make sure limewire is actually set to 6346.

forced IP: if you forward the port, limewire should recognize that and set your IP automatically (if you have force IP on).

ultrapeer in/outgoing: there's another thread on that topic you might wanna read. it's also in the 'connections' section. i think it covers your question.

uploads: since they're happening in chunks, 30% may well be all a user wanted to download from you. that's totally normal.