So I updated my Eleksmaker A3 Pro laser with Grbl v1.1 to use with LaserWeb software. Very nice, cross platform solution, have a look at: https://github.com/LaserWeb/LaserWeb4. I use it to lasercut from Mac OSX, which I could not do with EleksCAM software.
I just wanted to post here the GRBL setting I used, in case someone (like me) is interested. These values were determined experimentally, and could be far from perfect:
$32 = 1 -- Need to be set to enable Laser mode.
$100 = 81
$101 = 81
$110 = 1000
$111 = 1000
$120 = 100
$121 = 100
The acceleration and speed seems very close to the original EleksCAM settings.
Hope this helps someone!