Replying to FT high fives shin bang

starting to develop really bad bruises around my shins, I'm pulling the straps across as much as they can go but still my shins move around. Its hardly any space between my shin and the liner but it obviously does some damage after a couple days of skiing. Plz don't suggest i get bootfitted for new boots either or any of that stuff because the boots have been fitted by a ski shop and molded properly, other than my shins right now the boots are perfect.

So,im thinking booster straps might help tighten that extra space around the top of the boots or is it just because the FT high fives use a slightly shorter liner than the other boots( ex. tom wallisch FTs) ?