There is some research but not much. Years back someone here linked to some and at that time 9/10 showed the best performance.
input him on 9/10 based on that as well as, regardless of the profile, he will have consistency. Just thinking it might be worth playing around with a second set.
BTW, the scanner just spits out a category. It just said Quad so I assume that IT implies you should match to the skate size. Not that helpful, that would have been our first experiment anyway.
And it would seem ProSharp has data they used to make recommendations to pros but still seems like some experimentation and collaboration at the end of the day.