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So i am running a few hours of tests like suggested.
1. It seems smoother in the X direction than the Y. Y grinds more (in a few inches of the run)
2. My dimensions inside to inside are perfect, within 1/16″ however, when i run the larger square test, one side of the carriage doesnt quite keep up with the other, and on one end, it may be up to 1/4″ off from back to front or side to side. It certainly could be caused by the grinding just slowing down one side and not the other as much.