OK, I settled on 15 degrees and made a jig for cutting necks. Just for comparison, I measured the neck angle on my Hofner project and it's 15 degrees. So I thought, what the heck, works for me.
I made the jig from scraps and some ply I had laying around the shop. For a couple bucks, I got a guide rail from Sears that fits the track in my table saw. Neat!
Over the summer I might build another one with a rotating piece so I can dial in any angle I want. This will work great for 90% of my bass projects.
