Its worth setting the machine level.
That way the the sliding bearings are ewually loaded hrlping smooth travel.
Replace the timber insert if worn, or you will find small offcuts going down and going bang. Its those offcuts that causes the blade to deflect enough to take a chomp out of the sliding table edge.
Square the fence by trimming up a big bit of mdf, say 900mm square.
Trim one face. Put that face to the fence do 1 cut, then turn keeping original face against fence. Do another trim cut. Then check to see if your piece is parallel, front n back.