your acceleration values of 250 are really low so those too should speed things up considerably. But your machine might not handle those speeds and accelerations so try some tests first. You might have to lower the values some.
Good catch. That won’t effect the speed but will effect the quality of the burn as it goes from 256 levels of power adjustment to 1000 levels. The $30 variable in your firmware(on your laser control board) states it supports 1000 levels but LightBurn will only generate 256 level with the max value of 255.
Just guessing that it’s because the firmware originated on an 8bit device and with 8 bits(11111111) you get 256 steps. With many limitations to working with these 8bit micro-controllers there was a sift to 32bit and so the range of possible levels was changed to 1000.
If you google a bit you’ll probably find some of the history of this but that’s my best guess at this “feature”.
The biggest problem is that you’re using very old firmware (likely GRBL 0.9 or earlier), which doesn’t have ‘Laser Mode’. This means that every time the power output is changed, the machine will pause briefly. (for others reading, the giveaway is $32 being called ‘motor lock’)
If you can re-flash the board to GRBL 1.1f or later, and enable Laser Mode, it will move smoothly and the result will be much faster.