Hello Kiwi,
Haha, yes I do have Chinese connections, my wife is originally from China (Tangshan)
I believe Ashley did the graphite stuff after I left (which was sometime in 1984 I think). The pickups were almost certainly Kent Armstrong but potted in black epoxy moulded from an original Ebony pickup cover Ashley carved himself. I seem to remember the actual ebony pickup covers on very early models) were problematic (resonance problems) which was solved by the epoxy. You may notice the impression of the grain of the original ebony former in the moulded pickup covers.
Unless it has been replaced since, the 3 band you mention was actually a 4 band with both lower mid and upper mid filters controlled by one dual-gang log/antilog potentiometer. It was a bit experimental in those days but Ashley seem to like it. I am sure there are vastly better active units available these days.
Here is is a pic of my fretless ...