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OK, that is why your steppers were singing with the higher accel settings.
Here is the default settings for the 500mm. You will need to change the $130= (x max travel, mm) and
$131= (y max travel, mm) for your X-Carve size & travel.
Use the yellow GRBL button in PicSender and make the changes in the left window. After getting the default X-Carve settings changed back, use the Save to backup the settings.
Here is the recommended grbl changes when using the J-Tech PWM grbl, so make those changes, then back them up also and then select Send. The instructions will explain how to change back and forth with the different grbl versions also.