Well Tempered Amadeus setting question

Hi,i just setting finished my WT Amadeus TT,but i don't know is it right?before i setting the Amadeus,i read a manuel,and they say the golf ball must place central in the bearing cup,is it need absolutly in center?or......,because if i place the golf ball in center of the bearing cup,my cartridge(Benz Micro Ebony) cannot parallel to the protractor,so now i setting the golf ball is little bit close to the bearing cup but not touch and so the cartridge can parallel to the protractor,so is it correct?thanks