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First thing I would recommend is loading grbl from the Inventables fork. That version has the initial parameters that work best with the X-carve.
Alternatively, you can change the parameters to the default values one by one.
Look here:
If you have the 1000mm unit change $130 and $131 to 790.000 If you have the “new” version of the X-carve I think the default for X is 740.000