I see Carbotech offers 1521 compound pads for GRC. Over $400 for both axles. I mention because I have a set of these on my 86 and they literally don't dust at all.
Unfortunately they squeal when they get hot. Sometimes even just warm.

Lots of people swear by them so I'd love to hear how they do for people with GRC. I'm not a big fan of the very gentle initial bite but otherwise very linear modulation. They seem not to wear the rotor almost at all and both will last approximately infinity miles they way it's looking. I guess all energy is turning into heat and.. sound.
I am also a big fan of Akebono OEM pad material. I think GRC's dusts a lot because there is a ton of pad area compared to typical applications of this material. If I could find pads with this compound to fit my 86's calipers I'd buy a set in a heartbeat. Dust be damned.