A thought occurred to me the other day, and I completely forgot to post up about it.
Is it possible to have separate correction values (as we are given OD and holes currently in Z-suite) for the X-Y axis? Some circles I have printed in the past (lets say nomial is .74) vary from .744 at some points along the circle, .74 along others, even down to as small as .735ish. Is there a possible solution to this (via software or otherwise)?