Linearity makes a huge difference to raster centering.
Almost all my raster centering was lost AFTER linearity adjust. It IS really iterative. I compensated for this after linearity... which then took me back to astig (which I had done before). I'd save some time leaving astig for last, after the electronic geometry.
Also, you shouldn't mess with the HWidth pot to move the amplitude as implied in the guide.
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