I'm confused. If each step, which is in reality very small, read on the DRO as 8 degrees then wouldn't it have moved only a very little when it reads 360? Instead it is just the opposite. A full 360 on the axis reads only a few degrees on the DRO.
If I zero the A axis DRO in inches (G20) then go to mm (G21) it changes to 357.4285 degrees. Zero in mm and switch to inches it reads 340.2587.