Quad 0.5 profile has a recommendation from Prosharp, and was developped, for skate size 8-9(runner 280/288mm). If you apply this profile on a 254mm runner, its properties change in a way only prosharp knows. In theory, the middle section 10-12' becomes functionally more dominant and the original forward pitch becomes even more. In the worst case your son is skating on an extremly forward pitched 10/12' profile. If your son wants to try a new profile he could start with the Quad XS, Ellipse XS or Zuperior XS, all of them recommended from prosharp for the 254mm runner. I would suggest to try the Quad XS first, because it is more close to a single/dual profile and Bauer is selling it with their higher end skates out of the box. Compared to the 10/11' profile the Quad XS should give him more acceleration, agility and stability while maintaining the speed. But it's all try and error.