Ok, now we're getting somewhere. So, a jump test with force plates? If it's prohibitively expensive, that would make some sense. It would be the only way to really get the kind of accuracy you're talking about with something heel contact. It would also be something that would be fairly straightforward to automate along the lines of something like ReTul that's been done in the bike retail industry.
As far as those skate modifications, those were my skates not my son's. He's in more or less stock Makos. Slight modification to the pitch to make them less aggressive, but other than that pretty straightforward. That's my point, I have modified mine based on my own perceptions of what I needed to do to deal with my unilateral valgus. I haven't messed with his other than to provide the best fitting skate (Makos) with loose ankles (he goes two down from the top on Makos... crazy ankle strength). So, he has very good mobility and stride characteristics. Could they be improved? I'm open to the notion, but need to have a quantitative approach so that we know what is being done, why and how to go back. Skating is his strength, but as he rises levels, it's a less distinctive strength, so, need to keep staying ahead of the curve.
Anyway, I'll keep my eyes open for more info and developments.
Thanks,