Hence my request for a Uranium forum. You will only find uranium stuff there. I am (slowly) moving my collection of information to the uranium board just in case other people like to get a head start. The main reason for having that on a separate forum is that I need the possibility to place posts at the top and an unlimited time to edit old posts.
If your goal is to maximize traffic, then each board should have no more than 7 forums. 5 would probably be optimal.
When I open the Mish & Trotsky board, I usually look only at the top 6 boards since my screen is not big enough to show the rest. A stupid reason, yes. But that is how it works. And I do not think that I am the only one. (Of course I do scroll down from time to time, I just frequent the top 6 more for that silly reason)