Greatly appreciate the input. The filed feelers worked great! .020" at the first fret, .060" at the 12th, with .010" of relief on the high E and .012" on the low.
Tried leveling out the ramp at the high frets but I'm out of material to take off. Considering I don't really play above 17 on the bass side I'll live with it for now, and at some point in the future I'll fix it for reals.
Re Prostheta on the last page: All of the woodworking, neck shaping aside, has been done in sub-freezing temperatures in an uninsulated garage - far from ideal, and I expect some movement after each change to the piece. Shaping was a big bite so I'm not too surprised or torn up.
I don't really notice neck shape when I play, so I was happy with it thicker, but I needed less stiffness for proper relief - not going for a specific profile or anything.
I'm not interested in making a bolt-on for now. I'm confident that I'll resolve these issues and any I may have moving forward. In spite of them, I'll consider this build a success (presuming I don't set it on fire during finishing).