Good job. This is typically where we end up on our guitars, about .075 on the top and .060 on the bottom with about .005 relief. We use a radius beam with 320 to start as you stated but drop to 220 and do fret to fret leveling by hand, crown, then gradually work up to 2000 grit again by hand and then high speed polish. After a little break in on the fretboard strings practically bend themselves.