Ok, so it's an sha 15.15, 68 jet, 4-strokes at WOT while warming up. My old b6hs plug was at the dark end of the 'okay' spectrum, which was before I took out the three balls, causing it to rev higher, and run hotter.
I picked up a b8hs and ran it around for a while. Drove a few miles and it was completely white. With a colder plug that shouldn't be the case, right? There was chalky shit on the arm, above the insulator.