Maslow straight line accuracy

Cut a 48”x96” outline with the Maslow for one; To create a visual for aligning plywood and 2; to see how well it did at extremes
Results weren’t stellar but wanted to see is this the best that can be expected or do I need to keep to tinkering on calibration.
Left 47 31/32
Middle 47 24/32
Right 47 29/32

Top 96 2/32
Middle 96 5/32
Bottom 96 10/32

My setup is a metal Maslow with a 12’ top beam
Are y’alls results about the same or do I need to calibrate som more?