One other thing to check is the tightness of the slideway gibs. On a knee style mill, looseness in the Y gib can affect the X axis and vice versa. You can often tell by placing and indicator near the extreme end of travel and pushing or pulling on the table in the appropriate direction and see how much slop you'll get. You'll probably have to put up with a little bit, but the gibs should be as snug as will permit full table travel in each axis.
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