Just for clarification -
I see too many get hung up on pure numbers - this is all about feel!! Just because the factory says "X", doesn't mean it is an absolute, just a guideline! All the numbers depend on a pilots skill and how things work in different conditions! That's why you see or hear about so many different setups for different people on the same kite sail! Everyone has their own unique setup that gives them a certain "feel" with their kites!! What works for me, may not for you, and vise versa. Is it wrong?? Nope, just how it works for you.
As your tests showed, there is more flex in SS rods than Rev rods. But unless you can translate it into how they change your feel, they are just numbers on a page, not real life info for others to experiment with!
I encourage you to try flying more often and translate those numbers into how you "feel" about them!!