Thank you very much for the time you spent to record your detailed observations.Well you may be waiting a while for the track update. Though I did have fun at the PEC event, it's not really my thing. I already have too many time/fiance consuming hobbies I think there are a few guys here that track these rotors. They probably have good insight about their performance on the track.
Regarding the dust, if I have to quantify it, I'd say 20% of the OEM setup. I have to assume some of the buildup is road grime which would appear even on PCCB equipped cars. It really is a light dust vs the heavy dust coating I experienced with the OEM brakes. The cleanup for me when not washing the car, consists of a quick wipe down with a damp microfiber cloth. I would use the same method when I had the OEM brakes when not washing the car, but I can say the grime was more persistent. It definitely took more effort to get the wheels looking good. I think if PCCBs aren't in the equation, then these are the next best option.
I have been looking at various 911s and PCCBs were a priority as I really didn't want to be dealing with heavy brake dust buildup on the wheels of another car. But that mindset has changed because I think these are a really good option.
In similar fashion, I originally intended to option PCCB's on our GTS build. However, given the large amount of track days planned, I no longer believe PCCB's are the most cost efficient option for my intended use. Lately, I've been leaning toward the Girodisc/EBC Red option and your your comments effectively solidify my position.
The enormous amount of brake dust accumulation we experienced with our BS drove me BSC. The fact that buildup seemed to occur almost instantaneously after every cleaning made me hesitant to take the occasional quick ride. An 80% reduction is nothing short of a miracle and would mean I'd be more likely to randomly drive the new steed, rather than other options.