I was gifted a 9 inch pullman loaf pan and after many attempts, I finally filled the corners!
It's really beautiful and fantastic work! I learned some new things today, this Pullman pan and pain de mie! The lid does not seal tightly so no worry closing all the way. Some of the water turns to vapor, some CO2 and vaporized alcohol has to escape as it bakes. You got all the conditions right to fill the pan all the way and it looks delicious!