This may be the source of the stiffness misunderstanding: http://www.sapim.be/spokes/butted/super-spokes. Sapim clearly says higher spoke tension gives higher spoke stiffness. Since they suggest that the Super spokes can be taken to higher tension, QED they can be taken to higher stiffness. BUT there are two things wrong with this. First the marketing guys at Sapim got it wrong. More tension does not equal more stiffness. And second we already tighten spokes up to the upper limit the rims allow. So even though the spokes could take higher tension, the rim can't. Even if the more tension, more stiffness relationship were true, it is out of reach. Maybe Jude can't be criticized for believing Sapim's marketing hype, but she should know better about how much tension the rim can take. Ask Psimet. He pretty much agrees with 120 kgf as the safe upper tension limit of the rim, and that is what most good builders tighten to.