Hi Jonathan,
Thanks for your help.
I think I found the reason,
Bug T52238. Gravity ignores units scale. The issue is simply that certain subsystems of blender ignore the unit scale, while others do not. A mismatch basically.
I read some discussions about the issue. It seems the workarounds is to divide the gravity by the applied scale. In my case I changed the gravity to -981m/s² and it worked.
Suddenly, even with normal starting values, the physics well behaved.
This bug should be dealt in V.2.8, I still use 2.79.
In case it can help, here’s the link to my Blend file.
https://www.dropbox.com/s/vlq0mxuvnm03d8j/dominoes16.blend?dl=0
