He hates anything softer. Since ISPO/SIA, he has been in the white 130.
Because there is no standardized flex system, flexes change from boot construction to boot construction. It is an unfortunate and complicated story stemming from a myriad of plastic types, varying wall thicknesses, differences in shell fixations, marketing stories, and a few other things. Believe me, if it were an easy thing to standardize it would be, and I wish it were.
But with that said, we try our best to be as "realistic" and consistent as possible. And you have to remember that 130 is not stiff. 170 is.
Following that, almost all of our athletes who use our Overload 120 wish it was about 20% stiffer. But if we made it that stiff for actual public use, I guarantee you we would sell far far less.
Many of these pros (even super stylie guys like Keefer) want to have a stiff, responsive boot that can transmit the slight nuances they want to have quickly to the ski. They also need the boot to be supportive on huge jumps, taking landings at 50-60 mph. For most athletes, a soft boot translates to a sloppy boot with poor feedback.