Can't cut a straight diagonal line

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I have disassembled, reassembled, calibrated UGS, recalibrated, checked for square several times. There are new belts with appropriate tension, factory upgraded z axis kit, motors, etc. I can’t, for the life of me, get my xcarve to cut a straight diagonal line. I’ve noticed that cutting a square isn’t exactly square, off by a mm across 18" or so. The diagonal straight line drifts dramatically in the middle. Anyone else have this issue?

Thanks!
John

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How are you checking for square?
The frame itself or the carved shape?
I suggest making the frame out of square as needed to get the carve to be square using compared diagonal measurements of a rectangle carve

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Rails are squared, carve is off. WhenI adjust the rails to compensate to make the cut square, I still get a curve in a straight diagonal carve.

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