Why does a specific racket like the AP Lite have different RDCs in different sites? Which is which? Like for example... Babolat RDC stiffness rating for the AeroPro Lite is 73 here in TW and some says its 72 on a different site? Also, the balance point... its says 3 pts HH for TW and some site says its 1 pt HL. I have seen an AP Lite with me from a friend and it says 340mm/1 pt HL. Im confused now... Thanks in advance for the reply.