Toolmaster Of Brainerd
You know what a loon is, noodle head?
I've shaped a few necks and re-shaped a few necks as well. I can't imagine making progress with 320. I start with a rasp, and then go to 80 for awhile before working my way through the grits. But maybe I also wanted to take off more than 1/16"The Pattern neck used on the HBII's .875 (7/8) at the 1st and .953 (61/64) at the 12th which per your desired is 1/16" off ideal ...
https://www.prsguitars.com/index.php/support/article/neck_profiles
It is always enlightening how small differences make it work . When I dyed my Special's flame maple Pattern neck I did about that much , I enjoyed it . An afternoon with some 320 grit and you could shape it to your dream .. Stewmac Nitro sanding sealer and you are a happy camper after a light buff.