That is good looking bread. Not sure about the recipe requirements, but I found more success with getting bigger holes my using a higher protein flour mixed into the recipe, a longer colder proof and making sure there was some moisture when the dough was placed.
I'm feeling bearish, and I'm packing a Wusthof Grand Brisket slicer from MABA
Whip It Off, Chambers!
"perhaps...but then again...maybe not..."