when i got my legacy, i also got a kk bearing(the one sold here). i put it into my X-convict. instead of making it more unresponsive, it made it more responsive. it was less responsive with a stock bearing. does the kk bearing suk, or is there a problem?
there may be a prob with it. kk bearings are all about makeing it more unresponsive and will. have you tryed looking in it? you can take the side walls off it to check out the inside. also have you ever cleaned it? if not try it,heres a vid on bearing care.
later and keep it spinning.