Iím not sure what you mean by ďdecenteringĒ. I suppose that it might refer to the lens being assembled with an off-center element.

I donít believe that Minolta or any other major maker ever allowed a lens with such a defect to leave its factory. Its quality control was as perfect as can be devised.

If you mean that the lens isnít centered over the negative, I donít think that can happen unless the carrier is makeshift. The makerís carrier should be well centered over the lens. Likewise, the lens should be in the correct position so long as itís installed in the enlarger makerís lens mount and not in some jury-rigged affair.