After playing the last two builds for awhile now, the neck profiles are revealing themselves. I'm not sure I've ever built a neck that wasn't tweaked later, sometimes a hair, sometimes quite a bit.
For this one, I was very careful as I didn't want to mistake the extra width and mass as extra chunkiness. Spoke shaves and even finger planes are too much at this point, so a super sharp scraper is the trick. The profile was kind of a shallow, flat D, but after playing I realized it needed to be more of a C. Probably not unlike an Ibanez JEM, but translating that to the 8 string and making sure that you don't creep into the fret board edges and make knife edges takes some careful removal.
While playing, the "corners" of the D profile made the neck feel thicker than it was depending on where the thumb was placed, as well as blocking your ability to wrap smoothly around the neck and play up and down vertically with any speed. By shaving it to more of a C, it's a WAY more natural motion as your hand rocks up and down. In the end, a pile of shavings and a way better feel.