i'm not about to set myself up as an expert on baking bread. But these two things I know:
Don't guess about the final rise. Do the finger test to confirm that the dough is appropriately risen.
Spend the time shaping the boule so that it gets a tight skin and is a compact sphere.
This is what I am talking about. That pulling motion until you have a boule that will keep its shape.
These two things really improved the loft of my freeform loaves.