Using mouse_event coords VS pixels:

5000, 5000 - 87, 65
10000,10000 - 175,131
20000,20000 - 351,263

By trial an error, I noticed that I could take the X coord in pixel (87, 175 and 351) and multiply it by 57 to have the corresponding "mouse_event X coord".

I can work with this from now on, but I just don't understand WHY "57".