Turn on 'Smoothing' in Fusion 360. You'll greatly reduce your file size and lines of code, and probably clear that right up. On Walnut about 0.850" thick, I cut on diagonal with a spiral two-flute 1/4" bit at about 1/8" depth of cut, 18k rpm, and feed is usually 150 ipm (Saturn 2x4, 3kW water cooled spindle).
David