Are you really sure that women need to add 5 inches to their band size if they're under 33? Your sizing chart thinks I'm a 38C, despite the fact that Bravissimo, which specializes in sizing larger women, thinks I'm a 32GG. 36 bands put all of my breasts' weight on my shoulders, and 34 still rides up my back in the way that the first link warns against, so how is a 38C bra going to be a good fit for me? Is the chart wrong, or is Bravissimo wrong?
The chart does not seem to fit all women of all sizes. For you, I would go with the Bravissimo measurements.