I found that boosters only help upper shin bang(which I only ever got from way over tightening my race boots, now I know and don't use boosters). Thread maker has lower shin bang, right? When you put your foot in the shell w/o liner, and slide it to the front with toes lightely touching, is there more than a 2cm gap? If there is ANY more than that, the size is wrong, don't blame the boots, blame yourself for getting boots too big.. The other thing to do would be to GET FOOTBEDS. Your kryptons either came with intuitions w/o footbeds(and no they do not form one before somebody says that), or they came with the black/silver liner with a fairly flat footbed. Either way, if the shell fit is correct, getting these: http://www.alssports.com/alssports/product.asp?dept_id=3362&pf_id=FIHFFPFGLDAHGAHI&ad_id=froogle&key_id=SoleSoftecUltraSole
should help, you must re-mold the intuitions though(if they came with intuitions).