I think that nailing down the smaller more focused categories is the way to go. If you can make it both more relevant and more focused it would be both different and useful providing a real reason to give it a try.
also, should i brand each category as its own site, or is the current model ok?
http://football.rawsignal.com/ http://basketball.rawsignal.com/ http://collegefb.rawsignal.com/ http://baseball.rawsignal.com/
had to refungle some code to speed up our analysis, but it should be working. hope you like it.