Testing... testing...
After several not-so-happy outcomes, and one pleasing outcome, it was obvious that I needed to get better acquainted with the South African flours that I have. Previous bakes seemed to indicate that the flours' absorbency was different than I was anticipating, based on my previous experience with U.S.-produced flours. The only way to find out what was going on with any certainty was to do side-by-side bakes of identical breads, adjusting only one variable (hydration, in this case) at a time so that I could compare the outcomes.