I've been searching for the same answers and from what I've found online, you want to make a higher hydration loaf.
I've been following recipes from a blog called The Perfect Loaf, going to try this one next: https://www.theperfectloaf.com/higher-hydration-sourdough-br...
Does this book actually have a process that makes a "fluffy" interior like the baguettes and boules I can get everywhere in France?
Normally, my bread excursions always come up what I term "artisanal"--nice flavor, but kinda "chewy". I have no idea what I need to change to fix that, and I can't seem to find anybody who does.
I would even be happy making "Ye Maligned Plain White Sandwich Bread" just to know the process as I could probably figure out what the differences are. But I can't seem to find anybody who can tell me how to do that either.