Thanks for the link to the PDF. That's pretty much what I remember. Some of the limits are moot points, i.e. the 320Ns total impulse. You'll never achieve 320Ns and stay within the 125g limit of propellant, at least not with any BP or AP motor I'm aware of.
It would appear that, unless the rules were different 8 years ago, people were picking and choosing the rules they wanted in order to interpret the rules to allow 125g motors to be flown w/o a waiver. Like I said, I'm pretty sure NFPA rules only mentioned a total propellant weight and that's what the guys were using to justify launching small H motors with only ATC notification.
It's good to know I can launch my mid power stuff w/o the ATC notification because my launches are usually spur of the moment depending on the weather.
Mike