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is the surface the table sits on flat
then is the mag table parrell .does the table travel smoothly .
if when you shim something on the table flat does it travel flat .
:lolb:if so i would grind the table flat then the base of the mag table
but careful shining so it is not distorted as it is clamped down .then mount the table in its position and regrind the top surface .the table may not have been ground on that machine if the slides are reasonable it should grind parallel to the table .just shimming may not have the mag table sitting flat and it move between the shims or hollows in the machine table top face depending on what is on the table when th chuck is turned on.