rarely means 1 out of 10. The freeloader options only applies for your incoming connections, though.

Don't set your max uploads to such a high value. If you set it too high, you all you'll do is cause many 0k uploaders and lot's of trouble for the other users.

I don't understand the thing with the file not found, - what's that got to do with leechers?

After starting LimeWire, it will index your files (and in the future even hash them).