Zeroloc,
Is the problem that the blade is not perpendicular to the table when the saw is off but with tension on the blade? If that is the case, can you adjust the tilt of the table to make the blade perpendicular?
If the blade is perpendicular to the table but moves side-to-side while running, can you tell if either of the blade clamps moves sideways as it moves up and down and if so, which one moves?
I hope this helps but I may also be way off the mark. One thing I don't recommend would be to file the clamps. They are aluminum and need all the strength they have to resist the force of the blade clamp screw.
Good luck and let us know how you are getting along with this problem.
Jim