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PicLaser will give you the engraving size. The J-Tech grbl firmware uses S0-S255 commands to vary the laser power, not Z commands. You also have the feedrate set to 0.
First you should set the Gcode Dir. location. Then select the yellow GRBL button to make the grbl changes for your machine. Did you save them to a text file? Here are some other changes that needs to be made.
