Received my Southard a few days ago.
Put a 37 degree inclusive on with an Edgepro.
Usually I don't notice cutting performance improvement at 1000+ grit, but in this case it's very noticeable.
1000 was cutting paper well but with some resistance.
2000 started popping hair.
3000 shaves the arm with ease and cuts thicker paper like butter. Able to make wave cuts easily.
I wasn't sure what angle I'd get since I had to lay the blade flat on it's side due to the geometry. Laying the blade flat subtracted 5.5 degrees per side from the Edgepro setting. Set at 24 degrees per side, wound up with 18.5.
At first I was disappointed for not using a sharper angle, but it's cutting amazing at 37 so I'm no longer regretting spending 8 hours polishing the edge.
Will the 18.5 degree edge hold much better than 15?