A problem of CNC machinery that's built out of sheetmetal, rather than "the old way" is alignment of a rotary axis. Imagine an arrow mounted by the feathers on the rotary, dead center. If the rotary is not pointing quite true along the XZ-plane, yet the arrow was initially aligned to the correct Y down the pointy end, there will be a "narrow Y" close to the rotary and a "wide Y" far down away from the rotary, due to the rotation. Similarly in the other plane for Z values.
You need to point the rotary perfectly. Because that's not easy to do, Roland provide a firmware based correction system. Punch in the numbers describing the awful results, let the firmware correct for them, is the theory. The theory works fine for XYZ work such as 2-sided flips and falls over on genuine rotary work.
The jewelry forums are full of heart-breaking and tear-stained JWX-10 posts. I don't believe you will ever achieve success by relying on the firmware system to correct such alignment errors. Your time could be better spent perfecting the actual alignment.