You’ve enabled ‘Constant Power Mode’. The switch is on in the Cut Settings Editor and the M3 command was sent in the GCode. This can be seen in line 17 of the screen capture in post #6.
Agreed, the Laser does not appear to be delivering constant power.
I found this post from another community member saying that M3 Constant Power mode is not supported by xTool D1.
Just to make things ‘interesting’ xTool has limited the speed of the Z-Axis rotary along with speed limitations on the X-Axis. Others have also discovered that it’s limited to the 1200mm/min as you observed.
I haven’t tested it, but I have read that the Y axis rotary control isn’t locked the same way. There was a Hint toward that at the end of this article:
and here as well:
I haven’t found the settings for Y-axis control but that might allow you to move past the ‘interesting’ feature that xTool added.
I’ll attempt to figure out why the LaserGRBL wants 12,800 divided by the circumference of the object as the Y-Axis travel resolution.