Yeah, maybe i need an assistant for documentation...
It gets even more complicated because the impact of the mic position is different for all speaker types. The G12T75 has a far bigger cap compared to a vintage30. This is why a dead center position on a G12T75 can sound really good while is mostly sounds horrible on a Vintage30.
In order to do it right and take pictures for every setup, you would need to remove all the front cloth from the cabs
It's also possible to put small pieces of masking tape on the cloth to designate center of speaker, dust cap edge and speaker edge (not directly in front of the mic, of course)... Just to give a rough idea