Thanks for the breakdown, Chris! It's very cool.
One thing I would like to know: You have broadcasts by day of the week, and Sunday is very high. I'm assuming that that's UTC? Actual Sundays in any given North American time zone seem to be low pirate activity days in my brief experience following the logs here.
Another question, regarding the station ID. Relay 5150 is known to relay others such as RFW. I assume that those are counted strictly as Relay 5150 and not as RFW (or other pirates)?